http://espn.go.com/blog/truehoop/post/_/id/31011/looking-across-the-aisle He had public intercourse with Mavs players at the ESPY last night.
Yes, he should be fined. If you're told not to talk to your players, you follow the rules. But I doubt he cares anyway, he can afford it since he's a billionaire and all. Increasing the fine won't matter unless it's in the 100 million range.
since it was an event that lots of people were invited to, i think this counts as "incidental" contact, and if he writes a detailed report and sends it to the league he can avoid a fine.