Every year people show up with 1-50 posts that no one knows. They only show up to vote in the year end threads or to pimp some band they have connections/relations with. It skews the real results of the SOMB polling.
It doesn't skew the results because they either vote for the same fucking albums that everyone else does or ones that are so obscure that they have no chance of placing. Oh no, last year all these noobs came and voted for "In Rainbows." Well, too bad because so did the rest of the board. You take out all those <200 posters and you're going to get the same results (or you run the risk of them spamming the crap out of the board to "earn" their vote). So, no poll tax here.
Seriously, unless I have good reason to believe there are offbeat shenanigans being pulled, I have no reason to think that there has been any voter fraud. I don't know why you specifically get so upset about the legitimacy of the voting process considering you are always pissed about the results and usually disown them after #93 is posted. I'm the one who has to stare at these spreadsheets for three weeks and even I don't take the results to heart as much as you do.