I'm the number two bookcrosser in Canada (and not even half-way there to becoming a veiled threat on the horizon to #1, but I digress...) I have over 1100 books on my shelf, and prior to joining BookCrossing, I probably had 900 of 'em (which might be too conservative an estimate, but I think I've bought 200 since last October...)
I noted, however, the following.
Books I have passed on to other people, or released into the wild and were caught & journalled: 96.
Books I have purchased for myself to read and enjoy due to BookCrossing (whether it be another member reccomending the item, or a review in the form of a journal entry, or discussion on a forum): 16. Sixteen new books/authors I'd not even heard of - and me working at a bookstore and able to see new stuff on a daily basis - now purchased thanks to BookCrossing.
Books I have purchased, specifically to release, due to BookCrossing: 29. Yep, books I have paid for, just for the pleasure of most likely about 3 of them being journalled. But they're paid for - and almost always duplicates of books I already bought once and read myself.
So, out of about 200 purchases, BookCrossing has influenced me into making 45 of them. That's 22.5% of the books I've bought since October, to play with lies, damned lies, and statistics.
This of course, doesn't include books that I'm sure I wouldn't have otherwise bought, but had heard of, that when combined with the idea of releasing them, made it tempting enough to purchase them.
Nor does it include how many I've read through BookCrossing, and then reccomended to customers in my bookstore. Or that I've heard about in BookCrossing, and shared what I heard to a customer in the bookstore, and they purchased.
Just a thought.
'Nathan (making cents)