We need Wildcard Certs I will give you an example.
With a sub domain install of Wordpress Multisite you need a wildcard cert so each subdomain of that site that is created will be able to run under https:// and the Domain Mapping plugin from wpmuDEV will be able to map Domain names to each subsite created.
I have ran into this problem my self not realizing that a reg Cert will not work with out htaccess rules that I do not know how to write and lots of tweaking of the rules to make it work with domain mapping.
so Please offer this service.
+1 for wildcard support from me