A place to sell your domains?

I saw a post a while back that asked whether or not there was a place that he could unload his old or unused domains and get cash back. I dont remember who it was that asked or what the responses were but I am also interested in this topic.

For example, lets say that you bought a domain name for a new project. You gave it your all but it was just not a good idea. You are now stuck with the domain and you have a few options. Try and sell it someone else who is interested in the idea. Keep it and let it sit there. Or let it expire and lose 100% of your investment.

My question is..is there a place that you can sell back that domain name and receive a fraction of the original cost of the domain?

If this place does exist:

Can someone give me the link? How does it work? How is it set up?

If this place doesn't exist:

Why not? what is wrong with the idea? is the market too weak for this type of thing?

Basically what I am asking is why have I never heard of anything like this. I am sure it must exist..where can I find it?


Any information would be greatly appreciated