Your logic here is flawed, you say they'll lose money if they don't make it free. Either way, they'll lose money, and Roblox isn't a replacement for Minecraft. They're two separate games.
Bookshelves should have 3-5 slots like a hopper. You can store enchantment books in there to increase the chance of the same enchantment appearing in the enchantment table. If you were to put a sh...