Accepting VIP program pricing is at the discretion of the dealer, IIRC.
Regardless of supply and demand, an informed consumer would also e-mail (or call) a range of dealerships to find the best combo of customer service and price on the vehicle they want. For example, the BRZ will have extremely limited supply, and I've read of one dealer doing a $5k markup over MSRP and another one with no markup at all. To me, saving hundreds or thousands of dollars worth the few minutes it takes to write a couple e-mails. If the price is close, I'll go with whoever treats me the best as a customer (and I'll give them referrals and the first shot at my future business as well).