[seacious]

People who had their account banned in the last few days before payment may be more likely to feel victimized, and therefore more likely to answer a poll to express their grievance.

[sillysaurus3]

That's probably true, and in hindsight it's exactly why polls (and statistics in general) are so difficult. Thank you (and also robryk) for pointing that out!

[ams6110]

It's why voluntary polls are meaningless. A true random poll would not have this bias.

[panon]

People who were banned are probably pissed off and chose 4days.