Jeremy Lin is in a weird position in his career.
He's not good. He's not awful though. There are worse players than him who have contracts and who get minutes.
So on one hand, it's easy to say (and I do say this) that it sucks for him that he can't get a deal with regular playing time when other players who are arguably worse than him DO, but at the same time recognise that it's all relative. Yes, it sucks for him, but he's still got it better than the vast majority of people ever will. He's made over $50m in his career just from playing, not counting endorsement deals an stuff, and he's 30 years old. He is, if he's managed his money sensibly, set for life.
Is it sad for him on a personal level that he doesn't get to play NBA minutes? Sure, and of course it's never good for a decent person (which, by all accounts, Lin seems to be) to be upset. So it sucks.
But am I going to get upset for him because he doesn't get millions more dollars to play? Not really.