> There is no economic rule that says that riveting should pay more than taking care of the elderly or food delivery.

There kind of is - it's the same reason B2B SaaS tend to make more money than B2C - it's easy (easier) to sell someone something if they can make money from it.

If I can pay you Y to rivet some sheet metal together and sell the finished product for Y * 10, that's a much better outcome for me (economically) than paying someone to take care of my elderly parents. In fact, maybe I'm not mean, maybe _I_ don't make enough money to afford to pay someone to take care of my elderly parents.