Professionalism is a two-way street. Punk's should hardly be solely called into question considering the company he works for/with.
People are too inclined to stay with the employer because they have the advantage when they feel like something is unjust. Even if Punk isn't right in this case, what he is doing still absolutely is. If he feels that something is amiss or someone(s) are being misrepresented then he should demonstrate his dissatisfaction, just as he has.
But at the end of the day, I'm not a dirtsheet. I'm not going to pretend to know what the breakdown is due to. None of us know and likely will never have a true inkling until there's some sort of shoot or biographic DVD released. And even then, that's one person's opinion. Honestly, I wish more people would be like him. There's so many guys worse off like Kofi Kingston who's been an ambassador for the company and has never been given a shot at anything whilst others have come in and overtaken him. Zach Ryder who got himself over, and waited until management didn't like it so they made everyone forget him by making him a footnote in the Cena saga. If these guys stood up for being mistreated, the ridiculous creative and corporate structure would have to be reconsidered.
That doesn't mean it has to become WCW in 1999 with guaranteed contracts and guys making sure they get top pay for minimum work. It just means talent gets some sort of say. Guys in WWE today are so afraid that they can't go anywhere else and make money that, or that they are in the place they'd always dreamt of and it couldn't possibly not be all it promised,that they'll put up with anything. And will continue to. Sickening really. Wrestlers used to be all about having balls. Perhaps that's part of the reason people find it so hard to invest in many mid-card WWE guys, and so easy for Punk.