Many of them probably don't realize what they are doing and are focused on their new toy (STi) since they clearly could not or were unwilling to do what it took to get enough "go" out of the WRX. When you go in to look at an STi (not buy one) and the salesman makes you an offer you are too excited to shop around (ALWAYS SHOP AROUND) and you buy the damn thing that night after 6 hours of negotiation......the last thing on your mind is unmarrying your AP.
As far as fixing yours I would think it pretty easy to fix. The ECU can be removed by my wife in minutes. It's under the passenger side carpet. If the dealer won't help by clearing out the ecu with a reflash (they should) send it to Cobb and they should be able to correct it. Annoying...but totally correctable.