The answer Ed, is an easy one. as it can be found in the publication 'Iron Man:Corey Parker:The Autobiography'. Mr Parker, a QLD origin and Australian mainstay for a number of seasons and the Broncos best player, tells us he finished his career on a salary of 250K a year.
At the time of Parker's retirement, Wayne Bennett following that player payment formula, could not give Wallace more than 100K a season so let him go to the Gold Coast.
The Broncos then found a prop willing to adhere to the 'Parker' player payment formula at Newcastle of all places. This player was willing to forgo 315K a year and sign at Brisbane for 85K. Enter K. SIms to replace J Wallace. Korbin will now top out his earnings at around the 100K mark over the time he plays at Brisbane, due to the imminent increase in the salary cap.
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Mr Parker's book was last seen in the 'fiction' section of QLD bookstores if you ever wanted a read.