I feel the same way. If the decal were something of a personal nature, or business related, I'd say remove it. But if it's for something like this forum where you do want more people to learn about then I'd leave it.

But as mentioned in an earlier post, more dealerships than not (in my experience) remove the decals anyway.

They're kinda like some of us. I remove any advertisement tied to the dealership as soon as I get home. I'm not about to be a free billboard advertising their dealership. And a lot of dealers don't want to advertise something their not affiliated with either.