Is there anything (besides cheese) preventing me from doing this?

[Milo33]

I have a psedodragon familiar. He spends most combats hidden on my person. A spellstoring amulet of mighty fists only costs 2000 gp. I can get the party cleric to cast channel the gift into it, (or just learn the spell itself.) Could the familiar attack me with his bite attack (1d2-2 damage) and release channel the gift on me? If so, it seems I just found a level three pearl of power with a 8000 gp discount. I could even craft multiple amulets and have the familiar change them throughout the day.

[Ximen Bao]

I can't think of a rule against it, I just don't think its as good as you think it is. You're still burning a spell to cast a spell each time.

With a pearl of power it's a straight extra spell.

How to make this idea work for you is to put a buff spell in the amulet and have your familiar bite you to boost your action economy. I used the same principle with an alchemist and touch injection, although that's obviously more spell intensive.

[Morgen]

Well have you been rolling every saving throw your familiar should have been making for every trap, AOE spell and so forth that it has/should have been affected by?

If so perhaps this might work once in a while. If not you'd better stay away from it.

[Joesi]

It's not too much like a PoP in the sense that:
1. You will probably take damage. 1 damage isn't much but it is still some damage.
2. This is a GM's-discretion sort of thing I suppose, but I'd say you could only make use of a single amulet unless you had multiple familiars since slotted wondrous items [can] have a adjustment period before being usable

Quote:

Sometimes a slotted wondrous item must be worn for a period of time (typically 24 hours) before the item's full effect manifests

3. It has the minor caveat/stipulation that your familiar must be with you and uses it's action. Essentially it won't/can't be doing other things.

4. Most importantly, It requires refilling! This means that it's useless in consecutive-day situations where there isn't down-time. Personally in the campaigns I've played, that scenario is exceedingly common— maybe about 80 to 90% of all sessions don't have any down days between them. Might be less for you, but I don't see how it still wouldn't be a common situation that is at least in the 33-50% range.
This is the reason why I don't see why someone would choose a "preserving flask" over a "boro bead" considering they're the same price (the only advantage is you can gain a slot for a spell you won't cast more than once).

Also, you said 8000 GP was the price difference as well as that AomF costs 2000 GP— I don't see how you get to either of those conclusions (with the exception of crafting price of an AomF). AomF is 4000 [or 5000] GP and 3rd level PoP is 9000 GP, so you'd be saving 5000 gp.

So while it is cheesy, it's fair within reason, since you're getting a near-50% discount on an item due to 3-4 drawbacks, or at least 1-2 quite significant drawbacks.

[Rynjin]

It'd be 2k if he crafted it.

Though if he was gonna do that he could craft the PoP for 4500 anyway, so he's still not saving 8k. Even though he wouldn't have saved 8k anyway because 9k - 2k is still only 7k

So bad math all around.

[Dekalinder]

Someone must still be using that 3rd level spell slot for this to work. So, you aren't actually saving any spell slot or money. What you gained is a little action economy of having you familiar "casting" channel the gift instead of you (or you ally) for the price of 4k.
Since is still such a conditional bonus, it's seems pretty fair and really not that cheesy as you might think.

[Joesi]

Dekalinder wrote:

Someone must still be using that 3rd level spell slot for this to work. So, you aren't actually saving any spell slot or money. What you gained is a little action economy of having you familiar "casting" channel the gift instead of you (or you ally) for the price of 4k.

Not exactly. Yes the 3rd level spell slot needs to be input, but if that's done during a downtime day that's no issue.

Like I said in my post, it is an issue for all the days where there aren't downtime days preceding them.
It also might even have use on days without downtime preceding them in situations where someone had at least 1 such spell slot open by the end of the day. In that case, instead of "losing" that leftover slot upon arrival of the next day, it can be carried along to the next day via the spellstoring mechanism
It acts like a battery/capacitor. It is still a major downside compared to PoP, but it does do more than you say.

Personally I think the supposed saving of action economy is extremely negligible. This is because many/most spells are either cast outside of combat, or only cast a small number of times per combat, meaning generally characters won't ever be under the need to use PoPs while in combat unless they want to cast 2-3 of the same spell more than once in a single combat. Maybe it happens more than I think and I just can't personally relate to it though.