I don't think CP3 needs to make decisions based on salary anymore. He's been in the league and paid well for 16 years. He will get a HUGE pension from the NBA when he retires. And has endorsements. If Phoenix is his best shot at a ring he will stay. If he gets a ring THIS year who even cares wtf he does next year.
He doesn't need the cash but he is the president of the players association. So what he does is viewed by everyone in the league and he needs to be able to explain it, to a certain extent.