My first summer out of high school and one summer during college I was a "summer time millionaire with a cardboard suitcase". That was 1967 and 69.
I flew a 135hp Super Cub with a Sorensen belly tank. The 69 season was near Pecos spraying low volume methyl parathion on big ass irrigated pima cotton. At the busiest part of that adventure I flew 176 hours in a little over five weeks, flying seven days a week. That old Super Cub carried enough fuel to fly from sun up to early afternoon and the low volume made the chemical go a really long way.
It was lonely living in a tiny one bedroom trailer house and getting up at 0430 to the be sitting in the airplane with the engine running waiting for enough day light to launch.
It's considerably different today with all the fancy equipment, turbine engines, air conditioned positive pressure cockpits, stereo, GPS instead of flaggers and semi-crash proof airplanes. I bet pilots carry their clothes in a fancy leather bag instead of a paper sack.
Seriously though, it can be hard and dangerous work if you aren't extremely careful. Getting in the business today requires lots of flight training and certification for the chemicals.
I grew up flying all the old tailwheel stuff so it was easier to break into the business then. When I had 2,000 hours probably less than 50 of it was in a nostril wheeled machine.