I suspect the argument might run that by not doing something about it you encourage others who might have paid to pirate your product ("if he's not paying why s

I suspect the argument might run that by not doing something about it you encourage others who might have paid to pirate your product ("if he's not paying why should I?"). But this (if it happens at all) will frequently be offset by those who pirate now but might become legitimate clients in the future. People in this category might be students (no cash at the moment but will have in the future) or those pirating just to see if they like something (one of the reasons home taping never killed music - because through compilation tapes you had people doing your marketing for you and finding you new fans). In this instance you not only lose nothing now but you're actually building product and brand awareness. Certainly I'd say that effort put into stamping down on this might be better spent trying to convert people to real clients in the future. The only other thing I can think of is whether there's any legal aspect whereby if you fail to defend your IP you lose rights. I believe that this is the case for trademarks but don't know if it extends. If it did it might mean that you had to put up at least a token fight. Broadly it seems that the best strategy is just that - some relatively low barriers more as a reminder than anything else and then leave it at that.