You don't get it. A cheap car doesn't have to be cheap:
A BMW 135 starts at $35k while an evo mr starts at $37k.
The money that went into the Evo went somewhere else then luxury. Like how the money went into making the Corvette one of the best bang for your buck performance car. The interior might not be the best, but it will go and leave your nicely appointed BMW in the dust.
A car might cost the same, but it all depends on where the manufacture put the development money into the car.