There are certainly a lot of reasons to not vote. The political setup is most countries of the world today is really messed up. It will take a lot of time and effort to even effect a very little change. And some people might honestly have just lost faith in the whole system. They do not believe that any of the candidates or aspirants for office have anything to offer the general populace. So, what is the point in wasting your time then? Others in less developed countries even think that their votes don't count, elections are rigged anyway. Honestly, if you consider that your votes don't count or none of the candidates is time-worthy, what is the point in voting in the end?