This is a very reductionist view of worth. Your model implicitly values people's non-working time at zero, which is true as far as GDP is concerned, but is pret

This is a very reductionist view of worth. Your model implicitly values people's non-working time at zero, which is true as far as GDP is concerned, but is pretty clearly false as far as how actual human beings chose to live. If fewer people are doing nails or cleaning other people's houses, then those people must be doing something else. Maybe they're working a job which is less economically productive, but which they enjoy more. Maybe they're not working and they're spending more time with their grand-kids. In either case, it's a real improvement in their quality of life. If your model doesn't incorporate personal preferences not related to the purchasing capacity of your paycheck, then that's a flaw in the model, in my opinion.