My counter point to that would be that it's probably easier to jump ship for the extra cash once you've won a premiership, let alone 2 in the case of Crighton. I would say it's harder to jump for extra cash because more than likely, and as is the case for Crighton, he is being offered a lot more by a weaker team. So, in the case of Moses - do you take the extra 100-200K a year to go to the Dogs or Tigers but start from scratch at a premiership tilt? Or do you look at the team you've got at Parra and say to yourself, my best chance at a premiership is staying with the Eels?
Crighton has 2 premierships now. What's left to prove at the Panthers? And if they can't get anywhere near the Bulldogs offer, why would he stay? He's still got plenty of years in him at NRL level - the challenge of turning the Dogs in to a contender in the next 4-5 years might hold genuine appeal (+plenty of extra $$'s)
So yeah, I reckon it's harder to take less money and remain loyal when you're re-signing for the reigning Premiers...