so like, where are you finding all these 7-9th level spell scrolls?
how many gp would this take to buy the ones that actually are available?
how much running around is required to acquire these scrolls (i'd love to find one place to pick up 3 or 4 spelltraps, spellstrikes, etc)?
3,200,000 divided by 6 characters is 533,333 apiece, which for most characters capable of obtaining such scrolls, is about one to two levels. and assuming you dont keep each and every one of the four, 500k is what you're wasting per.
you can make a pizza by tilling the land, growing wheat, planting tomatoes, raising dairy cows, constructing a kiln oven. or you can go to the store and buy the ingrediants. or you can call papa john's.
all in all very clever if it wasnt so darn useless.