Re: Why would you?
"The push for all websites to use https is all very well but isn’t this putting even more strain on the IP4 address shortage? One of the overhead of https is that every domain needs to be on a separate address."
These days using SNI on TLS you can serve several HTTPS websites from one IP address. so the need for individual IPs per site is not a requirement anymore. Although some older browsers can't cope with these such as any version of IE prior to 11.