One, this isn't a "supercar". It's an exotic kit car
Now that we got that out of the way, there are a host of reasons, only a few of which I will list:
1. Most important, regulations. A car manufacturer has to comply with zillions that cost millions. A low level kit car company gets around this for the most part
2. Parts sourcing. This is a frankencar using various parts from cars that already exist. The ME-412 is a real Supercar. Not something that the general public has dubbed a supercar. BIG difference. The people interested in plopping down big money for a supercar don't want a franken car. They don't want a car with Neon door handles, Avenger gauges, 300C seats, etc etc etc. They want a bespoke beauty.
3. You can make a bargain exotic but it's not going to look anything like the real deal. Go check out this car in person and then go look at a Ford GT. The difference in quality will be huge. Better yet, go take a look at a Mosler in person, then go look at a Zonda. Custom **** costs money. The lower the volume and the less shared parts, the higher the cost goes.
There's no secret formula here. For Chrysler to make a true "supercar" it's going to cost a **** load of money. Lexus made the LFA which isn't even a true supercar and it costs $375k. Why? Because of the enormous cost of making such a unique and low-volume car. I guarantee you the profit isn't great on it, if it even exists at all.