There are people who DGAF, and there are people who don’t mind flying at a higher altitude, where the air is thinner and the resistance is less.
Oh, about the fuel thing… I go fishing with my Uncle, he’s got a little V8 inboard, probably spends $10 per day to go out and catch our licensed limits of fish. He’s got a friend who won the lottery and bought a big 1200hp outboard open fisherman, he’ll go blow $1000 in fuel in the same time to catch half as many fish, but he does get to go farther, faster.