Accessibility to 'reasonable cost' training varies greatly by country.
For example - I went out last week and flew the Remos LSA for a dozen TNG
at an airfield near my training school. That is a towered airport with ILS on all runways under the DFW
Class B airspace wedding cake. The airport is a AA
maint location and a FDX regional hub.
It cost me nothing to use that airport. In Europe, Australia and possibly other places it would cost as much as the aircraft rental in airport fees.
A potential restriction is health. For men in the United States - a surprising number have red-green deficient color vision. As do I, my father, my brothers and all my grandsons. You can get a PPL with deficient color vision but you will be restricted to not flying at night.
For a few hundred dollars in the US, you can take introductory lessons at a few different flight schools if you have choices in your area. Learn if you 'have what it takes' from more than one CFI. Test fly various models of aircraft - high wing, low wing, stick, yoke. Compare the flight instructors, the attitude at the school, etc.
Even if you go no farther - you will at least have a better understanding of what you like and what you do not like.
Now as far as ultimate costs - if you can afford a Ferrari, you can afford a LSA aircraft. Maybe not new with glass and all the bells and whistles.
Unlike the Ferrari though, you cannot just buy it and run it into the ground with none of the maintenance. Airplanes have to be maintained properly. With a few exceptions, you cannot park the aircraft in your backyard. There is parking spot or hanger rental, insurance, etc.
Most of us though are limited to not owning a plane, but renting. That appears expensive because you are pulling $100-$150 out of your pocket for every hour.
But it is a lot cheaper over a year than all my friends who race dirt track sprint cars.
I know people who spend more on Flight Simulator with new computers, multiple monitors, physical avionics stacks each year than flight training and will never get in a real cockpit.
Not all who wander are lost.