I've never really been a very good budgeter and have never had a book budget. I've been on a book buying ban for the last few months, but that's because my TBR piles are threatening to topple over and bury me, not because of overspending.
Even before I started blogging, I borrowed most of my books from the library and didn't spend much on books. What's funny is that the longer I blog, the less I use my library.
Between NetGalley, review copies, and blogger contests, I found that I have more than enough to read! Add BEA and Comic Con, and I think that I'm spending less than ever on books (except for ebooks, but those don't count because you can't see them....shhhhhh, don't tell).