Let's face it, how boring would it be if the same person (or handful of people) kept winning every month? Also, the "everyone who didn't this calendar year" option is a bad idea in my opinion, because a person could win in December and then win the next month in January as well...
People keep raising the whole "Could win twice in a row because of December/January thing" which I can see is a valid point. But what people are failing to remember is that--to the best of my knowledge--that has actually only happened once, and that was Maz, tying with Ralph I believe one month, and then winning outright the next month.
After that, there's myself and perhaps one or two other PEELers who have won with only a small amount of months inbetween.
People are going on about the Dec/Jan thing like it's a common occurrence when clearly it's not.