I actually kind of agree that EV certificate inspire more confidence when buying something on a dodgy website that you never heard about. But for that one needs to be tech savvy enough to even recognize what an EV certificate is and how it is different from a DV cert, and I am sure that even most developers aren't sure exactly, let alone the wider population. So I doubt it gives much benefit to any website.
If only there was some common, easily visible browser UI element that told users when an EV cert was present, so they didn't have to understand the differences between certs.
