The grim reality here is that in pro pool, it's Matchroom and Predator that negotiate from a position of strength. The players, as a group, wield little power, and this has been the case for a couple of decades now.
The case history of late is that when players play hardball with event producers, sponsors and promoters, they usually fail to get the results they seek. Three examples in American pool in recent years are a) the CSI 10-ball event at the BCAPL Championships, eliminated in 2013, after some players harassed Mark Griffin over the entry fees and the payment deadline, b) the Ultimate 10-ball, eliminated in about 2015 after many players boycotted, and c) the Super Billiards Expo 10-ball, where the prize money was reduced after players demanded an increase in added money. These were events with high purses once upon a time, but the players just wouldn't leave well enough alone.
If the sport of pool grows, the players will wield more power and may prove well positioned to dictate terms in many situations, but until then, they need to get out of the way when event producers increase their investment in pro pool by creating new events. Obstructing the efforts of the few who are inclined to invest significant money in the pro pool product is not well advised at this time. The players (and their sponsors) need to swallow a little pride so that the sport can grow. Is that fair? Some will say yes and others will say no. Is it necessary? Yes, it is!
Comparisons to pro golf are comical. Golfers, who long ago established themselves as superstars who are capable spokespersons for products inside and outside of golf, negotiate from a position of power. That's why pro golfers bargain from a position of great strength.