Frankly, I own the site & domain, and so therefore I own the rights to the name. This doesn't have anything to do with money though, I don't even have anything to do with the decals anymore.
What it DOES have to do with, is a constant & uniform style and quality with all of the decals. Anything with this site's name on it, people are going to perceive as what to expect from the site itself. So yeah, I'm strict on that stuff, because I want to maintain a reasonable level of professionalism. There are exceptions that have been made every now and then, but only when people are courteous enough to give me a head's up and I get a chance to make sure it's not going to look like a high school art project.