In 1996 Winston gained a huge amount from National because he COULD play off Labour and National. ACT has no such bargaining power, indeed National could entice the Maori Party if it so wished, which ACT - if it were strategic, would let it. After all, what better way to shore up ACT votes than for Hide to say National gave us nothing, and went to the Maori Party - if ACT only gets consumer affairs and say local government (although that does have potential).
National, you see, wants to dictate the terms of government, which it can only do if ACT lets it. ACT rightfully is arguing that Dunne being a Minister is absurd, as he got less than 1% of the vote. Even Jim Anderton's Progressives had over 1% of the vote in 2005. Be clear, Hide can't demand to be Deputy PM, but he can demand a single major portfolio and a minor one - National needs him, unless it wants to be painted as a party that prefers the Maori Party to ACT.
I'd like Hide to get Environment and Local Government - because it would deprive these from the obvious creature who aspires to the first one.