If contract values going around the press are correct or even close to being correct, then Haas, Vaughan and Sims are all earning very similar money. For me, Haas is the better player and more consistent than the other 2. This just tells me that the bottom teams have to pay more for lesser quality players (or are simply badly managed) although I will grant you that the Broncos have struggled in recent years.
If Haas went to the Rooster's or Storm or one of the other top sides you can almost guarantee it will be for less than $1m while he would want more than $1m to come to someone like the Dragon's or Tigpies, thereby chewing up more salary cap for a lower side. But hey, the NRL is happy with the even playing field that the cap is producing so who are we lesser teams to complain.
A bottom side has to either bend their salary cap out of whack and hope that player gives value for money and attracts others or you get a crop of guns that come through at the same time and wish to stick together like Penrith and hopefully us. Otherwise you just go round in circles and when you produce a good player they get poached by the better teams as they can't leave the place quick enough.