The barriers to entry are too high for most people who aren't doing it as a career. A PPL is, what, $10k-$12k these days? What's a basic, brand new 172 go for, $400k? It's definitely not a hobby for those with an average income.There are so many reasons GA should be doing well these days. Fantastic facilities, strong training demand, new technology, world class ATC, but for some reason it hasn't. That means there's other barriers in place...corporate, legal, bureaucratic, or sociologic.