http://velonews.competitor.com/2014/...o-track_338300
“I’ve kind of done the road now. I’ve bled it dry,” he told the BBC. “The road is quite cutthroat. The track feels more like a family and a closer-knit group of people.”
Have heard similar comments from buds who raced road and now ride primarily cross or mt bike.
Obviously not at the same pro level but guessing its more the business of pro road cycling that he considers "cuthroat" especially with the events of this year.