I don't know why. Most of the reputable tuners will send you an open copy of your tune as is for an extra fee, and the agreement to not pass on to others. Coming form HPT and GM tuning in the past, I was appalled when I saw how closed off the information sharing is for Mustang's. The software was lacking and everyone was so secretive.
Yes, a lot of combos will work great with a canned tune due to the inclusion of WB02s from the factory on these cars. But then there's tons of other things that can change how a car behaves that a user might want to setup differently and not have to go back and forth with a tuner to adjust small things like shift schedules.
Tunes have always been able to be opened and reviewed for GM cars (LS1 or higher) and yet there are tons of shops and tuners still doing great business.
My two cents -- any tuner should be doing it without a fee. I've never bothered with anyone who locks their tunes or charges extra for an unlocked tune.
If they don't trust you not to give it to all your friends, than I wouldn't trust them to tune my car.
Not really. I actually work in the automotive field and see everything. Average person will not be buying this to try.
I still think this is a great option for people that want to give tweaking tunes a shot.
I can assure you that this is incorrect since I've seen countless guys hurt their engines tuning themselves. It's both sad and funny. It happens way, way too often, though. Most dudes do it without ever even going to the HPTuners forum, too. Just open up the software and grenade the engine.