I seldom use the library because I don't like commitment. Having to return the books on time is way too much a commitment for me. And that's actually the truth, lol. 
I have hundreds of free books on my Kindle and I'm still accumulating more. You never know when I might be too poor to afford books or when they may stop offering free ones for my Kindle! 
In hard copy, I only read paperback books, hard covers are too heavy. I get most of my books at this great used bookstore close by where I live. The owner will keep an eye out for me if there is something specific I'm looking for and give me first dibbs on it when it comes in. Life's good.
Once in a while I do pay full price because of a need to feed my instant gratification thingy. 
I read a lot of series. I am a little OCD and I like to read the series in sequential order. I keep all my series and most I've read two or three times.
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