Yes, I was still supporting 9x at certain sites for industrial applications, mostly into the mid-2000's. I wouldn't be surprised it is still used.
But the thing is, I don't have to go to CR to find one of these machines. And also, due to compatibility issues, 9x is not exactly going to be working on their hardware for the older games. You can probably get the same amount of compatibility with XP for what they could run, which is better suited for the hardware anyway. Which, XP can pretty much run on any recent computer. So it's hard to say why ebay is so inflated other than people don't mind burning some money. I'm not going to spend hours and money traveling and to haul a dozen of those machines. CR at this point is best for somebody local who wants to spend the time refurbishing a bunch of machines that don't really have an audience. Not saying to throw them out, but I just don't so the interest there when I can pick them up here easily, and not end up with a pile of them that I don't think would be easy to get rid of actually. I've had piles of common machines, and perhaps it at some point was good to recycle some not very interesting machines.