Not every example costs $950,000. That's just how much it cost to design it, draft it, build a prototype, test the prototype, make tweaks, build more prototypes, make more tweaks, make the tooling, crash test it, advertise it, etc. What each car costs to actually make is probably (hopefully) less than what you sell it for.
For the small amount I know about car development costs, I think the numbers are pretty accurate, honestly.
@DurWinning I think you went the wrong way. 0.1% of the dollar value is the credit value. The Tsukuba Backdraft cost 2,050 credits to develop, which is 0.1% of the dollar value, making the dollar value $2,050,000. Basically, add three zeros from credits to dollars and move the decimal place over three spots from dollars to credits. If the Krieger 616 cost 875 credits to develop, it cost $875,000 to develop. Basically, 1 cr = $1,000.