I view the difference between regular software and DRMed software as like the difference between loose walnuts and walnuts still in their shells. With the first, I just open the pack and eat. It's easy. But with the second, I need to go off and find my nutcracker (it's somewhere in the kitchen, we only get it out at Christmas) and work on it for between a few seconds and a few minutes before getting exactly the same type of nut. It's a pain in the ass.
Hence, DRM isn't going to stop me from doing anything, it's just going to piss me off, and that's no good for future sales at all. So, if you want me to buy your stuff, screw the DRM. I'm usually a nice person, but I tend to do bad things when people piss me off...