I have nearly 500 at present, but way more on calibre. (Kindle 4).
I do find I am easily distracted and sometimes flit from book to book if I can't make up my mind, but I also am so glad I have calibre. Sometimes I'll read a book and go "ugh!" hitting the delete button in disgust, only to change my mind later.
Yes, I do have a tag on calibre called "crappy books" just for fun, but mostly for reference, most are sample downloads of books I have warned myself to never buy.