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I'm wondering if their is any article or rule regarding the number of spells a 'average' higher level wizard would have? If for instance we rolled up 7th level characters for a quickie one night game...how many spells known per level could you expect a 7th level wizard or witch to have?
PS: I vaguely recall that WotC had something like this way back in 3e days on their boards. That would work very well if anybody had a copy.
I don't know about an average NPC, but my first order of business as a wizard is to find another higher level wizard, pay to copy his spellbooks, and then make duplicates. I would have to say about 1/4-1/5th of my gold goes towards this.
Since npcs have infinite gold, I would assume they have every spell on the list up to the highest level known, and then maybe half of those.
A 7th level wizard would have all 0-level spells and 14 additional spells of 1st - 4th level (typically four 1st, four 2nd, four 3rd, and two 4th) just from the class itself.
I typically allow for a 50% increase in the 1st - 4th level spells (six spells of 1st - 3rd level each and three spells of 4th level). PCs may then buy scrolls from their starting cash to increase that number.
Like Thraxus said : give them their automatic spells as per their level.
Then, use whatever ratio of the wealth you wish to have as spells. With that amount of X GP, you can buy your spellknown for something between the value listed in the "scribing spells into you spellbook" table (lower bound), and that value plus the market price for the spells on a scroll (higher bound).
The former, the lower bound, means your wizard had a free access to spellbooks to copy, or found some spellbooks/scrolls while adventuring, while the latter means he bought all the scrolls at market price then scribed them into his spellbook. Ouch. I'd go for something like 1/4 to 1/2 of that interval. Problem comes with expensive material spells, which will affect the higher bound, but not the lower bound. For that matter, just ignore them and use spells of the appropriate spell level without costy materials for the scroll market price (higher bound).
With that method, you will have a fix price for each spell levels, so fill your spellbooks till you bust your X GP budget.
Note that the costs for scribbing the spells in your spellbook have changed from 3.5. Paying 100 GP for level 1 spells or 200 gp for level 2 spells (etc.) at low character levels was just mean. Now it makes more sense.
BTW, I wouldn't give NPCs infinite gold or all spells or whatever. It just says to the PCs "kill that wizard NPC, his spellbook is fully filled!!!". I say give them minimum spells, plus whatever is needed storywise if it busts their granted spells as per their level.
-Jelly