Just because you are not using it, does not mean that they can't do anything about it. The first name I ever registered way back when, was ebaywherehouse.com. This was before I knew anything about domains or trademarks. Within several days of registering it, I got a C&D letter. I ignored it and then I got an email saying they were going to sue me if I did not turn it over to them immediately. I turned it over without even thinking twice. Now what would have happened had I ignored the second request? Who knows, but I sure as hell didn't want to find out. Do yourself a favor and don't even mention the name anymore, list it for sale, or even acknowledge that you have it. Just let it expire untouched.