While I agree with you the use of our data for consumer consumption is abominable, the reality is that these buying programs are not going away. Each month, Zag is adding more and more of these organizations. If we can't trust other dealers to not price below invoice on these programs, as you astutely pointed out, then we certainly cannot trust dealers to hold firm on not allowing Zag/Truecar to publish our DMS data while still allowing us to participate in their programs. The two go hand in hand.
If we don't allow access to the DMS, we can't be on their program. If we don't get on the program, some other dealer will. Remember, we can't trust the other dealers to hold firm and not participate. 10-15 deals a month for a store that is doing 40-50 cars total is huge and has too much appeal to pass up. If they don't get the data from us, they will get it from another dealer's DMS.
I fully support what you are getting at here, but the Zag/Truecar buying programs are a behemoth that will only get bigger over time. Close rates are 3 times that from manufacturer leads. And if done right, they still make money. The big stores dominating markets have too much market power to compete against directly. Once a small store grows big enough, they can shed the Zag lead source, but until then it is one of the most powerful lead sources available.