Better yet, how about tomes that act as Vet Rewards. They take about 80aa's to complete and upon completion they become one time use expendable items. So to follow in the ways of vet rewards there would be:
Tome of Complete Recovery (One time use complete heal)
Tome of Expedient Recovery (100% Rez)
Tome of Hastened Learning (50% bonus xp for 1h+DI effects)
Tome of Ferocity (1 minute of 50% increased damage + 50% additional chance of melee/Spell crits)
Tome of Fortification (15 mins of max stats+resists)
Tome of Shielding (one use 10,000 point rune stacks with rune tome effect)
The tomes once complete and become a Potion/item/clicky of any sort, they are lore and no drop, to prevent stock piling and abuse. This way there is something for people to dump xp's into, still sink money into 1-5k I think would still be a fair price. Then noone would ever feel like they've wasted their life pressing buttons for no gain in xps.