Do you seriously claim that janitors in the 25th percentile make about the same as programmers in said percentile, on average - that the average is the same for

Do you seriously claim that janitors in the 25th percentile make about the same as programmers in said percentile, on average - that the average is the same for all occupations? I rather doubt it. I mean, it makes sense that return on all sorts of investment should be about the same once the respective markets stabilize, but some things aren't investment, they're luck. Being good at something that is in demand is more like sitting on a gold mine than buying stock.