Real problem, so they say, is the lead content. True, they do have to refine it separately and have a separate supply and accountability system, but that is doable and the cost simply passed on. But the lead issue is being driven by EPA and will make 100LL go away eventually.
Fixed wing general aviation is costly, but does not have to be prohibitively so. I am sure a lot of you guys spend more on your guns, motorcycles or sports cars then I do on my plane. You can buy simple two place airplanes, even super fun classics for anywhere from 15K-30K. Simple four place planes maybe 25k-45K. A small two place plane will burn maybe 5-7 gph at $4.50/gal. That is a shit load of fun for less than $30 per hour in gas. Sure you have annual inspections and insurance. My insurance is about what I pay for my car. An annual for a single engine fixed gear plane will run $600-$1000 per year depending where you live and your relationship with your A&P/IA. If happen to have a small classic airplane that qualifies in the Light Sport category ( ie Luscombe 8A, Taylorcraft, Cessna 120/140, Eurcoupe) then you go to a short FAA approved course, get a "repairman certificate" and you are authorized to do all you own repairs and inspections, effectively eliminating all maintenance labor cost. Then you have the amateur built market. Build your own from a kit and pay for it over time as you acquire the various phased kits. It is like buying the plane on installments but no interest. If you are very careful, you can buy a completed used amateur built plane. You can do all your own maintenance on experimental registered amateur built planes. And you can always go into a partnership. My fist plane, in 1982, cost $7500. That was $3800 each for my squadronmate partner and me.