Anybody who doesn't think the idea of running the pirate bay out of parliament is awesome, hilarious and/or a gesture they want to make probably isn't voting for them anyways.

They're not going for mainstream votes, they're trying to amp up a small base -- extreme works.

Perhaps the three votes wouldn't be cast in their favour anyway?

I disagree; most of the people who would regard it as an abuse of privilege aren't planning to vote for them anyway.

The average PP voter will probably regard this as a use of privilege, not an abuse thereof.