Agreed. But does it really matter when the car has as much power as the Trans Am? I don't believe he's going to take it autocrossing. I don't think performance is tops on his list. He just wants rims that look cool. You don't have to blow the bank to find rims that look good, but getting a set that was built light and strong and with performance in mind, and all that coming from a big-name company, will take a good dose of money.
I personally would be shopping for performance. That's what I'm interested in. I'd advise Silencer to shop with performance--or safety, depending on how you look at it--in mind, but I'm not going to say that his choices are crap. I like the look of these rims, and that's what he's set out to accomplish.