I used PreyPal.com for a few years when I was fighting them. I didn't have any problems with the name, and I won the issue - if not having to pay is winning. I've probably cost them some customers as well, but actions such as reminding people that they had to pay$600 million in compensation for the misuse of clients funds. That court action was the reason the moved out of the US and escape regulation.
It took up a lot of time - fighting stops you earning money, so I probably lost in real terms.