I don't download books, even if they're free, if I'm not interested in the subject - such a fantasy, erotica etc, and I always read as much about the book as I can to see if I might be interested... The same thing for paid ebooks.
My TBR list is long, due to MobileRead libary, which has a lot of 'I must read' books.
I have about 50 books on my kindle, I want to read, but haven't got to, yet.