Bitches be trippin' balls, surely. Stealing from an indie developer? I call faggotry, cheapassery and inability to get an erection. Shaaaaaaaaaaaaaaaaaaame.
Yeah, go to the guns' ini files, find "GoldValue" and remove that line entirely. Else, you could just set your starting cash way up in the sky. For ease of doing this, grab this ini file, go to Missions.rte in your Cortex Command folder, and put it in there, overwriting the old one. You might want to back it up though, just in case.