Nice Post with an interesting argument. Personally I will choose to vote but will spoil my voting card (and take a photo after) if there is no one worth voting for. The last 2 elections I have spoiled my vote and felt pretty good about it after :)
The reason for chosing to spoil my vote rather than just sit at home and not bother is to show that I do care and that I can be bothered to go and vote. I highlight my discust with the system with whatever comes to my mind at that time. The vote will be counted as a spoiled vote rather than for any party or person which is better than no vote at all in my opinion.