I hope you can appreciate how fortunate you are.
Though 4 Euros ($4.50) is less than half what I pay for most books I want on Amazon.
It would be very expensive for me to feed my book-reading habit like that. I couldn't afford it without libraries.
It's nice that you can afford to spend money on books, but we need a solution for everyone else, especially if we agree that books are a good thing for society.
Recently there was that op-ed in Forbes that said we don't need libraries because we have Amazon: https://qz.com/1334123/forbes-deleted-an-op-ed-arguing-that-... -- Was such a disaster that Forbes limped away from it by deleting it.