update!! Yesterday I asked about selling sites for actual stuff. This was after quite a frustrating attempt at listing items on bitmit.
I thought I was missing the wood amongst the trees but after emailing the bitmit team with my problem (no category drop down box) they helpfully got back to me within a few hours and it turns out I'm not a complete luddite. On certain browsers there are glitches, which they're fixing. I'm using a macbook, they said it's fine on chrome and firefox.
This update is for those who might've been experiencing similar problems.