Don't know why it's rare or why it's more expensive than the Oreca Vipers. Considering the C5-R's got destroyed by the Vipers 3 straight years before Dodge pulled funding. Great cars but the Factory funded Orecas had there number. they are both two of my all time fav GT1 cars. I loved there battles, though largely one sided, over the 99-01 Le Mans. Wish they were both premium. C5-R murdered everything after the Oreca Vipers left though. Both cars deserved a better showing as they were both extremely dominant GT1 cars for many years especially the C5-C6R's, post Oreca Vipers.