I didn't want to offer a service. I wanted a one-off purchase of Bitcoins, and I thought I would see if there was any interest in buying already registered .com domain names.
Users on bitcointalk generally aren't interested in buying domains unless they are really unique, so that may be why. What sections did you try posting in?
I think you are right. Most enquiries come from Google or direct navigation in my experience. The real advantage of Bitcoin in the world of domain name sales is the possibility of using multi-sigs as a form of escrow. I'd like to explore this, and I guess this is why I posted a sales thread.