Because he's a newcomer comparing to a player with the career of Calleri. I like el Gordo a lot as a player, he's my favorite argentine player
One of the arguments we used to support the request of a forum for Del Potro, was that the career or success of the player is irrelevant. What makes a player deserve a message board is having lots of people interested in him. That was the case with Del Potro, whose cheering thread had more than 350 posts.
Anyway, Calleri has a lot of followers who I'm sure would like to have a forum to open threads about him.
Thats enough of a reason for me to support the request.
I like Calleri too. More his personality and way of being than his game style.