The trade page is not an accurate reflection of who accepts Bitcoins right now. I conducted a small sample recently of one sub-section (educational software), and found that only 3 of the listed businesses still seemed to be accepting BTC. My own unscientific impression of the market at the moment is that there are quite a lot of sites that thought about accepting BTC, but no longer do.
Exactly, before we try to make any indicators off of the page, we need to have someone go through and actually verify all of them first (and check back regularly). We have to work at the speed of Internet.