I confess, I did download a few 'free' books from grey sites when I first got my reader
I just wanted to try them and see what was there. I found without exception that every single book I downloaded was poorly formatted and needed a ton of work to be readable. Then I got hooked into Fictionwise's sale/coupon/member sales, and when I realized I could get the same books for $3 each if I was careful with the coupons, I stopped going to those other sites. It's worth the $3 to have something proper and readable