Maori seats and ETS

Could someone explain how the Maori seats are seen by National as special treatment, whereas horsetrading over the Emissions Trading Scheme with the holders of most of the Maori seats in a willingness to disproportionately benefit the Maori elite (and earlier the not-so-elite Maori) is not special treatment?

Another thing: Who does the Maori Party represent? Is it Maori, those who voted for the party, or some Maori,such as those involved with certain iwi groups, many of whose members voted for a party other than the Maori Party.