> Generally speaking, if you have to pay people to do it, there is something nasty about the work.

I don't believe this is true. Almost all people need to earn money to live a reasonable lifestyle, society as it is.

Considering the number of hours in the day: enjoyable, non-nasty tasks may be off the radar unless they are paid.

I feel like what you are saying is an excuse for employers to treat employees poorly. "We're paying you, so..."

It doesn't have to be this way.