Yeah, no.
Your vote is your submission of your mandate to be governed and your preference of who does it. Not voting is a legitimate protest, IMHO, for one that doesn't believe in representative democracy (I believe in direct democracy or demarchy) and certainly for one who would see a pox both the houses of the leading two parties.
I do vote, as a way to try to support change, but I understand and sympathise with those that don't for idealogical reasons.