I myself observed the disparity in numbers of posts between orange and other colors of postings quite some time ago. I had already gotten my tractor, then discovered TBN, then began searching around for information.
At the risk of being politically tractor incorrect/biased, as a curiosity, not a scientific study, some time ago I perused each of the color forums and noted the contents and subjects with an eye to purpose of the initial poster.
My impression then was that Orange posters had a larger % of stories of projects/fun, fewer % dealer/mechanical problems and a generally higher joy/excitement rate than non orange posters. That said, there are truly a large number of red/green/blue posters who have fun with their equipment and few if any mechanical problems.