Solid method. Not sure I agree with others about it being morally "wrong," or how effective it is currently. I just know the model works, and specific to the offer referenced there is very little harm or foul for anyone involved including the person completing the offer, the affiliate earning commission, the CPA network also earning commission, or the end-advertiser who also gains valuable information about a vehicle that wasn't in their network of VINs. Looks like a straight win across the board to me folks.
That said, I think a lot of twists are needed to make the kind of bank most of us are hoping to make, but isn't that what we come to BHW for? To find ideas we can twist to our own liking so we can make the bucks.
I think the method both works, and is ethical. To what degree each of those things apply - well it gets a little grey in there.