Market value is bullshit.
A players worth is what he's offered. The nrl should have no say in that. How would you figure it out anyway? A players worth is different between clubs. Teenage Ponga value at the knights was way different to the Cowboys for example. Newcastle had years of the spoon, they had no class spine players and they needed a big signing to make them seem attractive. Cowboys had an establishes team fresh of a premiership, and established players in 1,6,7.
If a player wants to play for less let him. SBW aint no spring chicken, he'd already be reasonably set for life, one last premiership tilt would be worth a lot more to him, plus he probably has loyalty to Nick Politis and Robinson. Forcing him to play elsewhere because of an arbitrary 'market value' is BS