Marion would be a fool to walk away from 17 million dollars, SEVENTEEN MILLION DOLLARS!!!!!!!!!!!!!!!!
Especially since, as Lurker pointed out, he is already making more than max money for what he brings to the court. He is only 30 years old so 1 more year alongside Wade, if he proves his worth, will add to to his value long term.
IMO he is a legit star in this league, not a star you build around but a star that can be part of an effective tandem. He stays healthy, (Missed 12 games the last 8 years), he is a consistant 18-10 forward, 2 steals per game, 39-40 minutes per game, #6 defensive boards, etc. And then there are the intangibles, he disrupts transition offense, is a pretty decent one on one defender and he stays out of foul trouble. Hmm, isn't that what Phoenix is getting from Shaq right now? I mean without the defense, without the transition game, without the steals, without the health, without the minutes, oh and without the point production. Yeah, this trade made ALL KINDS OF SENSE. Seriously, head case aside, Marion has an awful lot of upside, and he's is still no Ron Artest when it comes to baggage.
I think he stays with Miami for the money and pulls an Otertag, has a killer year and gets max money in FA.