I'll never understand it and I don't really care about the reasons to do it. I also know that the people who do downvote every other entry (with that I mean downvoting entries that fit the theme and are not a complete graphic failures) won't read this or care.
But I needed to vent about it ... Sadly not the first time. It is tiring and ruining the fun for everyone else. Especially in smaller challenges where a tiny number of downvoters pull the numbers down without a chance to really counteract this ... Are these 3-5 Credits you MIGHT win really worth it???
How about you like and comment on newbies creations instead every day, gives you 5 credits guaranteed and karma points as well.
I am aware that I am way too unimportant to have this even reach many people and my challenges are tiny. But know this if you enter my challenges: I will no longer tip the top three, but (a) personal favourite of mine from below the top three, that meets the requirements, regardless of the ratings.