It's interesting how even that Wikipedia entry has fallen for the NBA's language on these ads by calling them "jersey sponsors." There's a significant difference between sponsors and advertisers, with sponsor being a term that tends to soften people up because of its positive connotations.
Just think of times when the term sponsor is used. It's like if a company sponsors a little league team. You're doing it so that they have the funds to even have uniforms, because, you know, they're a little league team that doesn't have money for these things otherwise.
But now, these professional teams think that if they say this word enough we'll absorb the feeling it engenders instead of questioning what it really means in this case. So that's another reason I don't like these ads: all the obvious reasons, plus the fact that teams, leagues, and the advertisers themselves treat fans like they're easily-manipulated fools.