I don't think there is one... I think this is the ultra-competitive, stubborn, proud side of Suh. I think that he thinks (with good reason) that he was the best player in the draft, and he knows the Lions think so (because they said as much), and he wants them to show him every ounce of respect that he deserves.I would really like for there to be a really good explanation for this holdout.
While people may see that side of Suh as a flaw, it's also what makes him great.
Right now though, I'm with Raiola. If they're offering him 40 million or more, just sign the deal and go out and try to make your team better.