It might be 'simple' in the sense of 'straightforward', but not in the sense of 'easy'.

Hard work plus long hours won't appeal to everyone. Self-employment might not be everyone's cup of tea either.

Assuming the figures are accurate, perhaps because most everyone doesn't want to? Some love it, but sitting in a truck day in, day out, far from civilization while only infrequently coming back home to see your family is not for most.

You could say the same about programming. Any five year old can program, but most people have absolutely no desire to do it, thus it takes a whole whack load of money to convince the general population into the industry. The HN crowd who see it as a fun hobby, who like to spend their evenings writing open source code for free, are outliers.

I find those figures hard to believe. https://www.bls.gov/ooh/transportation-and-material-moving/h...