2 Questions...
What could YOU use it for to make money ?
How could someone else use it to make money ?
I'm not talking about microsoft deciding their new anti-cryptolocker "bit blocker" tool being called that, I'm talk about average man in the street ?
Man in the street decides bitblock is the name he wants, finds its gone, he just changes his mind. You need to find domains which there are no alternatives, and there is demand for said names.
The exceptions would be block.co.uk and bit.co.uk they can be branded quite easily but combined they are not much use.