The bad news is that there are a hundred coin market cap sites out there.
The good news is that more are popping up everyday. And your name is very short (without losing the meaning) which is good.
I think your $4k asking price is fair. I would price it the same way.
Unless you are planning on developing out an amazing market cap site, then I don't see the value of spending your time throwing up a half-ass site as it would not increase the value of the domain at all. If it started making revenue, then that's a different story.