I think they are separate issues. On one hand, fans are basically telling ownership they should spend almost all their profits and earn very little on their investment. That is at the major league level.
The other side of the argument is that they are operating the minors almost like a sweat shop. I know the players could quit playing and find a job that doesn’t involve playing a game. However, they deserve to be paid at least minimum wage for all the time they are required to put in for their current job.
There is a vast difference between saying spend $20-$40 million/year on a couple of players as opposed to $4 million combined per year to a couple of hundred players.