I have not heard how much Napoli would get per year in a three year deal, but the same type of amount in a four year deal is pushing it beyond good logic. I think for the Sox I would like this guy much better on a two year deal after he tumbled quite a bit last season.
He is already over 30, is really not a catcher any longer and is only a fair fielding first baseman. I would bet that Big Papi Ortiz is a better fielder than Napoli although neither he nor the team seems to plan on him much at first base again this season.
Napoli may be making a large mistake if he signs in Seattle as lots of balls hit in Fenway off or over the wall end up being long outs in Seattle. He and Cody Ross might want to talk to Jason Bay about how one stadium fits you well and then how unhappy things can get when you are in another field that does not fit you as well.
On the financial side, I am never amazed at how important a few extra bucks are for these guys already making millions. And, to think I have lived pretty darn well on a school teacher's salary for all those 33 years.