Not really. The reason autos are relatively cheap are sheer numbers.
There are 10 of millions if not 100s of millions of autos on the road.
Sheer numbers produced keeps the price "low". Probably something like
over a 100,000 new cars are produced each year (guessing), while only a
few thousand (at best, another guess) GA planes and experiementals are
built each year. Another example is engines. Auto engines can be built
and sold for a few thousand bucks because of the economies of scale.
Aviation engines, OTOH, cost about $25,000 and up new, simply because so
few are made compared to auto engines.

All comes down to economy of scale.