Do they really do that, it seems so!
OK I appreciate in Business the name of the game is to have the best advantage over your competitors but....
Just found out that a local mobile phone shop recently looked into stocking the iPhone and was told that they could as long as they agreed the only advertising in the window, and outside, was for the iPhone so no competitor products.
It seems they said "No way". Not sure if this means they won't be selling them now.
I guess it's worth trying this tactic if you can get away with it, but kind of makes me wonder if this is the norm.