Cost per lead, VDP views, impression share, click-through — every one of those
is a proxy for front-end volume, and front-end volume is the half you have the least
control over. Nobody sending you a monthly deck has ever sat in the box, so nobody is
building the ad around which deals actually fund, which products actually
penetrate, and which customer walks in already structured.
There is a structural reason for that, and it is worth saying out loud:
your website vendor sells you the leads and writes the report card on the
leads. Cox owns Dealer.com, Autotrader, KBB, VinSolutions and Dealertrack.
Cars Commerce owns Cars.com and Dealer Inspire. I own no marketplace, take no media
rebate and resell no leads, so I am able to say that.
I bill you a flat fee and your media runs on your own ad accounts, at cost. There is no
version of this where I make more money by spending more of yours.