The Selective Ban of Public Trade Requests

How many times have we heard it? Granted, it's not all that common, but it certainly is a known quantity. NBA players sometimes say, into the microphones of reporters, that they would like to be traded. Kobe Bryant, for instance, has done just that. (May 31, 2007 to Stephen A. Smith: "I would like to be traded, yeah." There's no ifs, ands or buts about it? "No.") Shaquille O'Neal did it, too. Al Harrington. And others, besides. Well, apparently, that's against NBA rules. Stephen Jackson has been fined by the NBA for making a public trade request. The NBA points out that Ron Artest was once similarly fined, in the 2005-2006 season. But was Bryant? O'Neal? Harrington? Looks to me like players involved in that brawl in Detroit -- Stephen Jackson and Ron Artest -- get fined for trade requests. But does anybody else?