Check out this quote (from this article) then check out my thoughts below.

"And I wasn't there, either, when Roger Clemens won his 300th game," Selig said afterward, declining in a small scrum to commit to being there when Bonds passes Aaron. "It's something I'll determine at some point."

Here's a thought. You're the comissioner of baseball. You are (presumably) a baseball fan. You can get great tickets or a skybox to see Barry Bonds break the all time career home run record. At no cost to you. Wouldn't you WANT to be at that game? Some people will pay hundreds, maybe thousands of dollars to be at that game. And yet, from this article, it seems Selig is reluctant to commit to going to the game. Selig's done some great things (interleage play, geographic restructuring of divisions, etc.) but sometimes I find him baffling (this article) or even awful (attempted contraction of the Twins).