Thank you NJ Patent1,
Your questions:
"how much “originality” goes into compiling a list of cars to go-up for auction?"
Absolutely none. It's a very simple list of vehicles exactly as you describe.
"You may be overlooking possible liability for facilitating breach of contract."
Quite possibly. It's the Dealer who actually agreed to the contract. I'm simply acting at his request to pull the data and make it available on his phone for use at auction. In reality, Manheim is NOT going to start suing their customers (i.e., the Dealer). That's why they are more likely to "come after" me if possible.
"do the laws of that state visit liability for tortuous interference with contract or any other type of joint liability even if when there is no privity of contract?"
The state is Georgia. However, I'll have to research your question about tortuous interference and report back.
"If it's tough to calculate and prove how much money you cost the auctioneer, they would most likely take my approach (no guarantee) and settle or take an injunction."
Agreed. In fact, instead of damages, I'm actually providing a substantial benefit to the auction by facilitating transactions. Essentially, I'm helping to create a more efficient market where the dealer can easily find the vehicle he wants to purchase, and doesn't have to hold back a risk premium due to unknowns about the vehicle's value or history (he can see a CARFAX with my app). I think Manheim would have a very difficult time proving any damages. Their main issue is one of control. Essentially, they want to control the information flow to the dealers in their auctions. I've tried to license the data from them, but having made any progress.
Manheim has effective monopolistic control over the auction industry with 60%+ market share. They've also been purchasing a number of companies throughout the value chain (vertical integration). One could also argue that Manheim is being anti-competitive because they provide these run lists primarily to their own sister companies plus a couple of carefully selected partners. I know this is way off topic...however, to use game therory, Manheim would need to carefully weight the FULL risks of suing a small entrepreneurial company that's actually trying to help them make their business more efficient.
My best guess is that Manheim would send me a Cease and Desist. If I ignored this, they'd probably do nothing.