Ask HN: What domain have you been sitting on for a while?

Personally sitting on use.expert and mirror.forum (not sure if I will keep the mirror domain)

I maybe going to college soon so I will see what to do with use.expert domain, I snatched it for 10$ but to be honest, as someone frugal, its renewal fees are a bit eggregious at 40-50$ but I personally really like the domain and it can be used as my-name@use.expert or any service that I might wish to talk about under the parent service of use.expert (Think consultancy biz)

Either that or I will seriously think of selling the domain at a thousand dollars or more. I really don't wish to sell for the most part but if anybody is an appraisal expert, i think it would be interesting if someone gives me an estimate about it for example.