Not at all. Football players (especially those not on top division wages) have a limited professional career, and at 28 Porter is getting into the later part of his. It is perfectly rational to compare different offers to try and get your wages raised by putting pressure on your club. I'd have done the same thing in Porter's shoes and so would you. Anyway, it looks like it's the club who have taken an option to extend his contract, not actually him. He hasn't even done anything if I read the situation correctly, hence why Tony P has come on and said it isn't all over yet. He may still be able to buy out his contract or transfer for an increased fee.
That is an xcellent point. Just being in the shoes of the Nix, we would have preffered a swift decision