I agree that he will likely make the Yankees a bit more money from jersey/merchandise sales and a bit from the Japanese media/fans coming to some of the games. The question is this: will the Yankees actually look to invest some of that money in other areas of the team? Otherwise what good is it to us as fans for Ichiro to make the Yankees more money without it affecting the roster in any meaningful way?
I think the Yankees will pocket the extra money rather than reinvest it but I could be wrong, and I hope I'm wrong.