Having said that, I would advise you _against_ buying a MacBook [2].
[2] http://debarshiray.multiply.com/journal/item/181/MacBook_DVDs_etc.
And how is this the Macbook's fault ? DVD region encoding is enforced by all legally manufactured DVD players. Apple, OS X or Steve jobs has nothing to do with it.
And FWIW, the stores that you buy your DVDs from, don't necessarily pay attention to the regions *they get their supplies from*, hence your problem.