As Shonen once said (I think) suicide is purest form of self criticism.
And I agree with him as some aspects, but as an answer to original question was that
person selfish or not it's hard to answer if you we don't take deeper look to reasons that
cause person to make suicide.
Like, if person is badly injured cos' of car crash or something like that, suicide isn't always
selfish act. Sometimes people who commit suicide think that it decreases amount of pain
his/hers relatives would have to go through without suicide. But in cases like deep
depression I would say that person committing suicide is just too tired to keep fighting anymore.
Well at least I would...
ps. I'm more than happy to share more of my opinions if interested. Hit me with pm and give what you think/like to hear.