Put a feat value to wish and you'll have a consistent guideline how to do this.
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a lvl 1 spell can give +4 ac effectively all day (mage armor). So 4 feats for one 1st lvl spell per day.
Or true strike +20'to hit and ignore concealment. No feat equivalent. But at least 3 for concealment and 20 for stacking weapon focus (not normally possible).
....this comparison wont work.
A feat for a first lvl spell once per day is probably fine. Second Level spells probably should require you to be character lvl 3 and have two feats spent on lvl 1 spells....
Miracle would probably be a better point to base it off of, since Wish requires a truly staggering amount of gold to pull off on a daily basis.
Eh, to do the "cool" stuff, both require a 25,000 gp diamond.
Access to the entire Summoner list on a whim isn't cool stuff?
Mass raise dead is cool stuff by comparison.
Given that there is no feat adding spell slots except a mythic one, you can see that nobody thought it would be a good idea.
And the mythic one needs to be taken once for each spell level, working your way up. A full caster would have to take it 9 times to get his bonus 9th level slots.
Maybe you could do a non-mythic version of that starting with 1st level and going up to 9th eventually by spending 9 feats.
The only thing adding a (variable) spell slot is the bonded item of the wizard, which gives you one spell per day. And that one is a class feature.
For me it really depends on whether you're comparing prepared or spontaneous casters. In general you can't really match the current feat system with prepared spells because being able to switch them out gives an incredible amount of flexibility that you an't currently match with the raw feats system.
I think that you can only compare feats with level 4 spells since feats are mostly for direct combat which is what 4th level casters do. I would need 2-3 feats per caster level for me to be satisfied with a feat based paladin or ranger. These feats will probably also have to be able to ignore most or all prerequisites or else I'd lose probably 1/2 of the feats to taxes. Even then level 3-4 spells aren't really in the same category of power as feats since they have spells like break enchantment or tree stride. There's no feats that can cure curses or allow you to move as quickly as tree stride much less the level 5-9 teleport spells
a lvl 1 spell can give +4 ac effectively all day (mage armor). So 4 feats for one 1st lvl spell per day.
Or true strike +20'to hit and ignore concealment. No feat equivalent. But at least 3 for concealment and 20 for stacking weapon focus (not normally possible).
....this comparison wont work.
A feat for a first lvl spell once per day is probably fine. Second Level spells probably should require you to be character lvl 3 and have two feats spent on lvl 1 spells....
That is a good attempt at a comparison by Genetic Drift, but I find that judging trade-offs is a more enlightening measurement of value than comparison of results.
Imagine the following trade-off: a new wizard archetype gives a wizard an extra feat at first level but he loses one highest-level spell slot for all levels thereafter, regaining the previous lost slot whenever he gains a new spell level. Surely, most players would respond, "At all levels?! No way."
How about a wizard archetype that gives a wizard an extra feat at first level but he loses one 1st-level spell slot permanently? I think people might say, well that will work for a few low-level builds, and will be no problem at higher levels. We are in the right ballpark now.
Next, imagine the trade-off in the other direction, spending feats to gain an extra spell slot. I invented the following feat chain for another discussion, but it will work here, too.
Arcane Might
Your arcane might allows you to cast more spells.
Prerequisite: Ability to cast 3rd-level arcane spells.
Benefit: Chose a class that lets you cast 3rd-level arcane spells. You can cast one additional first-level spell per day from the spells for that class, subject to the usual restrictions and preparations of the class.
Special: This counts as a metamagic feat.
Improved Arcane Might
Your arcane might increases in strength.
Prerequisite: Arcane Might
Benefit: The additional spell from Arcane Might can be of any level up to the second highest level the chosen class can cast.
Special: This counts as a metamagic feat.
Greater Arcane Might
Your arcane might increases to ultimate strength.
Prerequisite: Arcane Might, Improved Arcane Might
Benefit: The additional spell from Arcane Might can be of any level the chosen class can cast.
Special: This counts as a metamagic feat.
I think many wizards would take that feat chain. So a 4th-level spell slot would be worth at least 3 feats. To be more precise, what is Improved Arcane Might gave a 2nd-level spell slot and Greater Arcane Might gave a 3rd-level spell slot. Would a 3rd-level spell slot be worth three feats?
Expanded Preparation allows an Arcanist to prepare an additional spell slot of the highest level he can cast or two of any level lower than his highest, but the benefit of the feat must be chosen when the feat is taken and cannot later be altered.
That's the Arcanist version of Expanded Arcana. It's extra spells known (even though they are called prepared by the Arcanist, that's what they are for the day), not extra spell slots you can cast with.
Magic Reservoir
Once per day you can cast any spell you have prepared without expending it. Spontaneous casters may cast any known spell without expending a spell slot of the appropriate level.
That's both a totally fine and mechanically boring feat. Plenty of room in the game for feats like that.
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Does have some cool combo power with clerics getting an extra use of a normally limited domain only spell, but that sort of synergy seems like a cool bonus, not a problem
In early 3.5, there was Extra Spell Slot, which allowed you one more slot, up to one lower than your highest castable.
To put a dollar value on additional spells/day.
Pearl of Power
Runestone of Power
Ring of Wizardry
Several ioun stones exist placing a gold piece value on feats. You should be able to engineer a price.