User blog comment:AYET/2013 Devil Fruits Tournament - Voting Eligibility For The Final Two Rounds/@comment-109.242.16.184-20130729123954/@comment-4754162-20130729154824

"Besides, an invasion of unfamiliar and suspect users doesn't happen so frequently."

I beg to differ, Aki. I think that was what happened during the final stages of DSP's Character Tourney. We could not know for sure because poll votes are untraceable but several times I happened to notice a sudden surge in the poll results, giving a feeling of concern over integrity. Thus the reason this tourney was done in this way instead.

Then there's the Toge Toge no Mi incident. Imagine if the votes were done using polls, then we will not know what actually happened (and the suspected culprit could not be traced and investigated).