i don't even see what's wrong with what Jay did. Keep in mind Jay was on fire at that point and here comes Dipset w/ Cam to Rocafella. A Jay verse on any of their albums would elevate them.
It was competition and Jay wasn't going to help others become hot of his verses. That's business chess for you.
Jay is the biggest he's even been and where are cam, jim and juelz?
Thats a part of Jay-Z people will never really understand, he is so entrenched in being a businessman that he makes moves not to make friends, but to make money and it amazes me that people still are surprised to hear of such stories. Also, I cannot imagine how many people have probably tried to have a Jay-Z co sign in any form just as a marketing ploy so his aloofness, I mean although he may look like a complete as*hole, is understandable.