We thought long and hard about whether to use LetsEncrypt and starting using it before our C'Panel supported it.
As easyhostmedia states, it is a loss of revenue for the host. We haven't sold any SSL certificates in ages, but I wonder how many customers we might have lost to our competitors if we hadn't started using it.
I know for certain that several of our customers came specifically for LetsEncrypt when we first started.
I think an EV certificate is always a worthwhile edition to any online retail site where the goods have any value, purely as it shows that the certificate issuer has taken the time to verify who the site owner is.
At this point, however, I have no plans to offer them myself.