Too many books... (or not enough?)

I've just moved into a new flat and have found that I seriously underestimated how many books I own.  I must have had at least a dozen boxes of books, if not more.  How on earth did I get so many books!?  OK, the crap I bought whilst working in a discount bookshop probably accounts for at least a third, and then there's the uni texts, the 'literary' texts, reference books, not to mention all the cookbooks (most of which I have never used)... 

And then there are the books I love.  The ones I read over and over again. 
I'm fairly sure that I have the largest collection of urban fantasy/paranormal/supernatural fiction outside of the Waterstone's 'Dark Fantasy' aisle.

I don't think that's a bad thing. Not really...