Just don't try to sell me a fiesta at BMW prices and expect me to believe there are "good reasons" for doing so.
There is only one good reason for doing so: because people will pay it. That's the only reason that a retailer needs.
I won't buy one either...but only because I have a non-restricted Beretta Storm. The retailer doesn't need me, or you, or any one individual. All he needs is enough buyers to allow him to show a profit with which he is happy. And in this case, I don't think that there will be any shortage of people lining up to pay for these guns...but time will tell.