So, if you like the library, you have more good books than you can possibly read, right? Sort of. I like science fiction, a rather small section of the library. Plus, I'm rather picky. If I read the jacket cover and the first couple of pages, and they don't hook me, there still may be a chance I'll enjoy it, but ordinarily I won't go on to find out. Life is short.
Of course you can get books through interlibrary loan, of go to libraries other than your local one. We're getting less and less convenient now, and in the former case you can't read the first page either, unless you visit Amazon.
Also, old library books may be dirty, or smell funny. It never used to bother me.
I gather it's not too hard to get books not from Amazon onto my Kindle, but so far I'm too lazy to fiddle with it. Any e-book three dollars or less is worthwhile for avoiding hassle and indulging impulse gratification, I've come to feel. It's convenient to be able to carry around several books easily, in case I lose interest in one. And my iPad is it's own book light, convenient for reading in bed next to my wife with the lights out. I know they have book lights for that with clips, but they will probably work better if I have an extra hand grafted on.