And also, you'll need IP addresses for each subdomains hosted, which can rack up costs. Though most of "modern" browsers and OS support SNI, this is less of a problem now.
False. I was able to get two certs issued for different sub domains for free. This was how I got around them charging $25 for revocation during heartbleed. I use the alt name in the certs as is.
I meant for hosting providers. If you are on any type of a hosting provider that doesn't have dedicated IP assigned to them, such as in case of "shared" hosting. If the service support SNI (Server Name Indication) then dedicated IP is not necessary, only complication is that if your site needs to support older browsers and/or OS, SNI may not work.
StartCom (or any of CA) doesn't care about IP address.
