What most people fail to mention with the C4C program is that not only did the Govt reimburse the dealership the 3500-4500 dollars on the eligible trade-in, but they(the dealership) also paid a "scrap value" for the vehicle as well.
For example my brother traded in his 1991 Chevy Blazer under the program. He recieved the full $4500 Govt money plus a $1000 scrap value from the dealership.
I can only imagine that a few resourceful individuals figured out a loophole in the system that was most likely a tax benefit as well.
I am assuming that the GNX (or any of the other unlikely vehicles on that list) was probably a high mileage, bad example, or had some sort of black mark history that made it's value low, or was not sellable as a "GNX" at all.
For example, If I trade in my eligible GNX for the $4500 plus a scrap value of $80,000 then I have now successfully moved $80,000 out of my dealership and into my private funds. This is money that I now don't have to pay taxes on as a dealer and the Govt just paid me $4500 to do so. And I have now moved my problematic GNX without hitch.
Kind of a great way to unload a car that was sitting around for a while isn't it?