Didn't know if you guys saw this already. I know this was a hot topic last year with some of the big boys pulling away from all 3rd parties.
http://www.autonews.com/article/20141020/RETAIL04/310209830/carmaxs-u-turn-a-return-to-web-leads
http://www.autonews.com/article/20141020/RETAIL04/310209830/carmaxs-u-turn-a-return-to-web-leads