I don't think that is the case, the spoiled ballots get counted in most countries, especially in countries like (I think) Switzerland where it is illegal not to vote. So it will have an effect, and anyway, you vote for what you, the individual want, not what the majority will also do (ie one of two useless private entrepreneurs).

Most countries also require a minimum %age of the populace to turn out, below that level, often around 45%, there has to be a re-election, and if no candidate receives a majority they do not win. It stands to reason therefore that if 50% of the people eligible to vote do so (and that is a reasonable number for elections in the west) and the majority votes are "none of the above" then none of the candidates can be elected. Parties are forced to find new candidates.

It is entirely realistic that as voters we are in a position to advocate a quiet revolution by means of turning out at the polling stations and voting "no confidence" in the present system by means of "none of the above". This, with Bush remaining in office until a solution is met is my preferred outcome.