SKY's multiroom is for their own packages only.
Setanta is not a SKY channel and only uses SKY's encryption and smartcards so if you want their channels on two boxes you have to pay twice.
Setanta is a standalone package and thus remains standalone for multiroom purposes.
Setanta can say it's because SKY want more admin money (probably based on subscriber numbers) but on the flipside if SKY is getting more money for a package which includes Setanta then Setanta would want a cut as well.
Most of the time both sides have issues in regards to money, it's the same thing that's going on between VM and SKY and both sides are only telling their own side of the story

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