A new hardback is typically in the £20-30 range, a new paperback somewhere around £10. These are bookshop prices, not Amazon prices.
As a fairly avid reader, I try to get through a book a week, so £520 a year for a hobby. Sure it’s more than a netflix sub, but books really are quite cheap, particularly once you look at cheaper retailers and second hand.
Granted if you’re collecting lettered editions from fine press publishers, that’s perhaps a different problem.