netcash dot com is worth something. Not the dot in.
netcash dot com redirects to i-cash dot com which is "cash for the internet."
I'd have to disagree: Although the domain may seem like an oxymoron, still the word cash is quite viable for internet ('net) businesses , I have sold domains with the word cash in them for high four figures and the buyers use them for internet based systems of some kind or other. Cash still means what it means and although yes, technically, it means metal and paper currency, that's not the entire connotation that comes to mind nowadays.
CASH is a fantastic keyword for domains. In fact, one of my top PPC parked domains has the word cash in it.