I agree it shouldn't change conversions, but I would also like to see some data supporting that. I run a lot of ecommerce sites and couldn't imagine the number of transactions not dropping if I just removed my SSL from every site.
We're not discussing whether or not you should have SSL at all. We're discussing whether it's worth getting Extended Validation, displayed as a green bar in browsers. E.g. currently at https://twitter.com you get a lock icon and a green bar that says "Twitter, Inc. (US)" — that's EV. At https://www.facebook.com you only get the lock icon — no EV.
