$2000 is more than enough to get someone to build or provide an exchange, $100-$200 a month for a server, $100 here $100 there for updates and you are still way under 10 BTC. Hell, there's exchange scripts already out there that you just set up config files for and you're good to go in no time at all.
Trying to get over $4000 for a long domain with nothing on it and no visitors is a loooong stretch for anything. The fact that nobody wants to buy it from 2014 should be enough to show you that it's not worth 10 BTC.
It is also proven that longer domain names discourage people from actually using that website, especially if they try to get on with their phones.