> Pretty much everyone except maybe the site administrator won't notice and won't consider it a problem when a lock icon is shown instead of a green bar.
I don't know if it's worth the money per se, but you can pin a couple of trusted CA root EV certs via HPKP and know it's much more difficult for someone to "accidentally" issue a valid cert for your site.
If you do that, users won't see a lock instead of a green bar, they'll be blocked from accessing the site at all (if it's not their first visit and they're using a modern browser).
