I think Kaurie and Nezerius are on the right track with their thoughts on a spending cap rather than an obtaining cap. This would allow off-Jobs to be geared for endgame content more quickly while also allowing players the freedom to farm as many tomes as they wish per week.

Imagine, for example, the ability to introduce to your static a challenge day where everyone swaps roles one day of the week to the Jobs they were able to gear up quicker using the spending limit.