@kickycan,
I've read most of the books I've saved, and probably all of those given away - though I still haven't knocked off Machiavelli, being stuck in the introduction, so from what I said before, 1400 - and then there's all the books I either sold back to used book stores or gave to thrifts, say 1000, totally 2400 - say, 10% = 2160, and that sounds way low.
Trying it another way, books per week and my age - 12 = 55 years and one book a week, that'd be 2860; however, I've very often read 2 or more a week, sooooo, 2860 x 1.5 = 4,230. Ok, round it up to 5,000.
I would have saved a lot of money if I only used libraries, but... I like my books at hand. The majority of mine have been from used book emporia, though.