I'd suspect it says more about Port than North Melbourne.
From what Polec said they never really even came to the table and (paraphrasing here) he hinted that he would have considered staying for less than North was offering if Port had tabled an offer that was even in the same ballpark.
Good point. I did read that he blamed PA for him accepting NM's offer because they were too slow meeting his "offer". PA were never going to increase his contract by 60% (as rumoured). Is he worth $750K a year?. I thought he was a fairly limited player with no right side and runs one way (he does carry the ball well though)