I actually disagree with your premise.
Remember that this whole thing isn't being run by the NHL where all Vegas has to do is throw 10,000 deposits down and tell the league we want a team. It's run by a group of dudes that are getting ready to drop a huge amount of money to get this franchise here, up, and running.
I put myself in their place and I wouldn't do anything with corporate purchases until I was certain there was a real base of actual people that are going to be the foundation upon which this entire thing is built.
Above and beyond that, I imagine very few of these corporate sales are occurring through the site, which is the only way to place a deposit at this point in time. So he can control what's being counted and what's not. It's definitely not in his best interest to try to push this thing through to hit his own sales goal when the reward for hitting the goal is empty seats and losing tons of money.
If it stalls out at 9,000 or so, I could see throwing some corporate sales in there to hit the goal, but I've got to believe corporate sales don't make up any real part of the 5,000 announced yesterday.
ETA: My fault, I got your post mixed up with another post concerning corporate sales. Point is still somewhat valid, though I hope.