@Kishido:
Boa may have more comedy material but we already have this love-attitide with Sanji. And still… she isn't even near a nakama. She isn't giving all for the sake of a friend and is still on the wrong side.
And I can't see her doing stuff for pther people besides Luffy. Hell even Sanji and Zoro are helping out each other and hell even Croc, even if he says he is an asshole, rescued Ace
I don't really support any characters anymore (or at least until I see someone I believe actually has ground to join) but "Boa won't do anything for anyone other than herself or Luffy" is just a really bad argument. She's helping Luffy save Ace who is a third party. It's very easy to see how you can get around that argument.
Hancock: "Oh no! Chopper is in trouble! Luffy cares for him as his nakama. I must save him!"
-or-
Innocent: "Help! I need help!"
Hancock: "Hmm… If I help this person then Luffy will insert long reasoning which involves Hancock feeling up Luffy at some point. Yes! It'll happen just like that!"
But yeah, that's a weak argument. Still... She isn't joining.