I think Pokerstars is trying to give their high-stakes cash games a boost. Full Tilt has been where all the action has been. Negreanu was trying to get things going, but a fish (tongue-in-cheek of course) like Isildur1 may bring out more action at that level.
It's funny because if you look at his numbers he is up a decent amount at holdem, but down a ton at PLO, and he insists on playing PLO. Watched him this morning for a bit 4 tabling 25/50 PLO, and was down about $10k from what I could see in a short time...