A lot of companies have to deal with this. vBulletin and Red Hat both immediately come to mind. I don't see how it would set you back. You know all the people you give the source code to, so you know who to go to about leaks. And most clients won't care about the source code anyway. What's most important is that you be clear about the terms under which your code is released.
If you are condisering making any real amount of money off of a thirty dollar product, then you probably won't know all the people who have it; on the other hand, if making money isn't the goal, then by all means, give away the source, OS projects are often a tremendous help to the community
My undrestanding was that redhat was always a service based company, making linux a commodity. Sure it had released its own patches, but on their own, these patches may not hold much value right?
Probably should consult a copyright lawyer.