It's a good question. I recently purchased basic SSL certificates from GoDaddy on a promotion for $12.00 each after previouly paying approx. $150.00 each. There's a whole bunch of features including a green highlighted address bar which will be missed out on. And I've never used the brand badges .
Comments on conversion rates would be very useful feedback, as I'm just observing the changeover to new basic certificates, at the same time as I'm seeing some conversion drops. It could be something else, so don't take this as the reason, just yet.