Does have some catchiness
I think it does have some "catchiness" to it, but though spamclinic was harsh (which I believe was not necessary), I'd have to admit he does have good points: its can easily be confused for another domain like "coinmine", because our brain usually autocorrects stuff for us.
You could have switched the two words, like minecoins , or coinminer, or bittycoins. Sadly, I think all these are taken. Yep, just searched; they are.
I believe you can still sell it because it does have some "catchiness", all the best