Airplane prices are ridiculous

Mark writes:

I'm sure that there are MANY people who would own an
airplane today if they could get one for $24,900.

I disagree.

It's very simple to get a license to drive a car. It's very expensive and
complicated to get a license to fly an airplane. And the regulatory burden
doesn't stop with the initial certification--everything about aviation is
heavily regulated. Most people aren't anywhere near interested enough in
flying to deal with all that red tape. Even if aircraft were free, relatively
few people would be flying.

Agreed, with many going bankrupt but it isn't due
to lack of demand. (you know...supply/demand)

What is it due to, then?