"We are all trying to be better MotoGP riders and we wouldn't be [on dirt bikes] if we didn't think it was helping" - Bradley Smith.
(http://media.crash.net/original/PA1637908.0008.jpg)
Smith is the fourth MotoGP rider to be injured this winter while training on a dirt bike. Aleix Espargaro damaged knee ligaments and Scott Redding fractured his sternum in December, with Yonny Hernandez then dislocating his left shoulder and Smith injuring his ankle. - Crash.net (http://www.crash.net/motogp/news/214495/1/sepang-best-for-limping-smith.html)
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Emphasizing the importance that MotoGP riders place on riding dirt and that it doesn't always come without a price.