Actually syronics, the thing is not as biased as you outline it. A lot of people do exactly as you say, and those are morons, period. But at times, we have a jump of several votes in favour of one option within such a short amount of time that it strikes remarkable resemblance to smurf-accounts partaking in the poll. That is when people that aren't morons start to point things out.
And then there are those people that like messing with other people's minds ... but those are a whole other story