I was thinking about this at work tonight and the more I thought about it the more it bugs me.
The way luffy's attitude changes about Merry
at the start of water 7 he's all "Merry's our nakama etc" and seems upset when buying a new ship is suggested. Then when we get to before the Usopp/luffy fight Luffy is all "It's only a boat who cares!" Then after Merry rescues them he reverts to "Merry's our nakama"
and it really got me wondering what the hell? I mean I know Luffy's simple but surely not that simple?