Not sure where you are located geographically Klay, but up here in Rocklin, CA (outside of Sacramento) current 05 V-6s are still running $3,000-$5,000 over sticker and GTs about $8,000 and that is for the base model at most dealerships.
I know that when Future Ford or Folsom Lake Ford sell their inventory they are very hesitant to sell at MSRP and that is only if a car hasn't moved in a few weeks. Their specialty vehicles, Roush, Saleen, SVT are nearly always sold at a premium and people are willing to pay it. Money flows well in this part of town and people just don't care.
As for the fastest Mustang to date, yes, I agree. That is a fact. I just feel that with the internals that they have on the engine and the suspension upgrades, it could be more towards the 500 - 600 HP range. Maybe they just don't want folks out there driving a 600HP rocket.
Jenn