Yeah like most banner ads I don't think many customers will click on the banner ad so I'm not so much worried about "leakage". Although it could potentially convince a customer to flip brands if the creative is enticing enough.
I'm more worried about it causing us to miss out on phone calls, showroom visits, and leads because our dealership information is buried. It goes against all website conversion best practices. Sure a customer can still find our info if they really want to, but there's a reason it's a website conversion best practice and that's because it translates into more results.
If this was a free or discount inventory listing site I could care less as that comes with the territory. This however is a vendor that I'm spending over a million dollars on annually. They better be doing everything possible to drive results and show their value to me, and this ad location clearly does the opposite.
Do you really think an OEM would refuse to advertise if they weren't guaranteed this specific display ad placement? I doubt it. Do you think a dealer might cancel their subscription over this? I guarantee it.
Autotrader just needs to revise the VDP layout a little bit like
Cars.com and CarGurus to feature the dealership contact info above the fold. Problem solved.