I've personally talked two people down from suicide, because I was convinced that given their prospects, they were indeed better off alive than dead. I promised one of them, with whom I am very close, that if I ever truly believed that her prospects were bad enough that she was better off dead, I would assist her suicide.

She told me it was a great help, knowing that, and to the best of my knowledge given her promise that she would call me if she was ever considering it again, hasn't considered suicide since.

That sounds like the sort of thing House does about once every dozen episodes. Glad to hear it actually works!