Although my TBR did increase after joining the forum, I've also read at least 50% more every year since joining too! When I was still buying all my books in paperback, I would definitely buy more than I read, but often only because of the old Waterstone's 3 for 2 offer. Now that I have my Kindle, I *generally* seem to be buying less, but that might just be because of my plan last year to clear my TBR, but I bought far fewer books than I read last year.
I do love my Sunday morning browsing through Amazon wishlists, reading reviews of new book in the papers, and still can't walk past a bookshop without at least looking in the window, although if it's a great bookshop, I can almost guarantee I'll end up buying some books too!