Because what else to use books on after you don't need money anymore? Speaking of books, I almost have 1000+ of each non-epic book... Lowest amount of any given book that I have is 489, and that's the one I used to level during contests for the most part...
I'm stuck on Donatien, need 2 more of his girls and 1 more from Silvanus + 2 from the new guy on the block (Bremen)... So 5 to go before I'm done with the standard ones, but mainly focusing on the contests to get a chance at epic items so I'm mostly fighting players or the newest guys rather than Donatien, although I haven't seen 2 of the equipment types as contest drops so far...