The best traders should win, the best strategies should win, the best articles should win, period. Due to the popularity points that often does not happen. Basically quality is not that important, because spam and friend-voting-for-friend will be a key factor in deciding these contests.
It makes me laugh when I see someone losing almost 100% of their contest capital after 4-5 days having 50 likes/votes or so...Seriously, what is there to like?

Popularity is ridiculous, even in the article contest. There is absolutely no correlation between number of votes/comments and quality of the article (if anything there's actually a negative correlation...). What exists is "I vote for you, and then you vote for me".