Vote. Spoil your ballot paper if you must (these get counted, at least in the UK) but take part in the process. Otherwise you are indistinguishable from those that couldn't be bothered or didn't care.
If a tree falls in the forest and no one hears it, did it make a sound?
If 40% of the population votes, they don't worry about the 40% who are use voting as the opiate of the masses... the problem they see is the 60% who didn't fall for the scam.
The arguments in the following essay are compelling. I haven't heard much of an argument against them, historically, other than pure sophistry (that domain sucks, etc) or tradition (you should vote because your ancestors voted)