Of course you don't see any problem with it, and honestly there really isn't any problem at all. Its just some places might view it as some kind of advertising (which it is, in essance...even though there is no initial monetary profit to be gained, its still an ad), and aren't cool with that. Others won't support it because they are worried about people in higher positions coming down on them for it, which risks their jobs and such. There are more factors to a simple harmless DVD Petition to some people than there are to us Muppets. You gotta remember, the world doesn't view things the way we do (ESPECIALLY when people think money is at stake, which they might in the rental market).
-Matt