I think these are conservative estimates binaryman. .net is second only to .com and a generic term like this would obviously have value to a credit broker. Does it get any type-in traffic? Even if not, I would compile a list of credit brokers, say 25-30, that are already listed on the internet (45,500,000 for credit brokers on google so shouldn't be a problem). The compose a concise email that you can forward to them (make sure you get the correct department) detailing advantages of owning a domain like this over their competitors, and state that you are accepting offers until such and such a date (say 3 weeks or so). Explain that they can reply to your email with an offer if they are interested. Store the addresses, then with a couple of days to go, put out anther email to the same people reminding them that the closing date is very soon (also include highest bid if you feel the need). I think this would be a good method to market this name and I think you will get mid $xxx at least.
Good luck mate.