[USER=5797]@BHavican[/USER] nailed it, the #1 requested feature from car shoppers is price negotiation.
A fully automated "buyer-driven auction" that matches vetted and accredited buyers and sellers could satisfy both parties.
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This concept mock is 5 yrs old. It's very very doable in todays API world.
p.s. [USER=16794]@Jon Singo[/USER]'s wife would like this 
