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General aviation has suffered particularly from two things - mounting cost, and the fact that it actually requires serious study to meet the requirements to acquire a private pilot's license. And while a private pilot's license is essentially issued for life, the pilot must periodically recertify - yep, more serious study - to be allowed to continue flying.
This "hobby", in short, isn't for those put off by academic effort, or for showoffs. You take it very seriously or you find something else to occupy your shrinking leisure hours.