To be fair, the statistics of brown eyes being more common is because ethnicities predisposed to darker skin tone also have a predisposition for brown eyes. Only 25% of Caucasian origins has brown eyes as a dominate trait consisting mostly of the south-eastern part of Europe. Considering the melting pot of America is 40% Caucasian to 60% Non-Caucasian, it raises the statistics of brown eyes being more common. 
With the majority of characters in this thread being Caucasians - the odds of their eyes being brown isn't exceptionally high unless they have darker heritage mixed in. If we had more of a mix of ethnicities, that would be one thing. But for a mainly Caucasian character thread - it's not surprising to see so many blue or green eyes.