The players and those who side with them have argued that owners make too much money from the players work.

What is a fair profit for an average NFL owner?
Keep in mind the following:

The highest paid NFL players on a per-year-average are just under $20 M. It is expected that with the next round of QB contracts this will easily reach $20-$25 million.

It is expected that within three years the average NFL salary will be almost $3 M/year.

Owners building new stadiums are investing hundreds of millions on top of the hundreds of millions already invested in their teams.