Do you really want to work for someone that doesn't or can't afford to play by the rules. You can get around it with OSS, but in the end is that the kind of business that is going to move and grow? If you educate them and they still won't/can't go legit, I think it's a good time to walk away before you invest too much of your time.
If they are willing to depart from their pirated software and move towards OSS, then you can help them usher in a new era of IT and save them some money down the road. BTW: One of my pet peeves is the line, "But the guy before you....". I'm not him/her so deal.