It occurred to me there might be a better solution that gets 2 birds stoned at the same time, Making a gold sink and keeping some of the hardest to find spells in the game a challenge to read. If the below suggested rates are followed it allows allows lower level chars to read books like holy armor or illusionary menace to 10 so they can level without having to waste points on INT.
Currently you can upgrade some spells with midas using egold, this functionality exists without needing to have the book.
What if Midas also allowed you to upgrade with regular gold *IF* you have the book in your inventory, effectively circumventing the INT requirement for reading books if you're willing to pay some kind of gold fee and midas eats the book for the corresponding level in your inventory.
Suggested Rate
* have the book, not the int *
Spell level 7-10 (Less is not necessary because int requirement is low for levels 1-6)
1k Gold Per Level + Book with Corresponding level
Spell Level 11-14 (Max achievable with current INT Restrictions)
10k Gold per level
15+ (Currently not achievable with current INT Requirements)
250k Per Level + 10 EGold + Book with Corresponding level
Out of retirement... for now.