The only real difference is for SSL. Anon FTP really can be done on the same IP now, and if not the IP for your website is of no concern. (if a customer of mine wanted anon FTP, I'd simply use an IP for that, not for some odd reason use the same IP for both his site and the FTP site)
Anyways, hosts that provide an IP per domain are digging themselves a hole, and they will not be able to continue that practice for much longer. ARIN about a year ago now, probably more changed their guidelines and expressly said that IP's for virtual domains on the same machine are no longer a valid "use" of IP's and they will not delegate more because you run out because of that.
So, view providers that give you an IP per domain as those providers that say "unlimited" bandwidth. Eventually, the shit will hit the fan and you'll be SoL.
Right now, I'm sure some providers are making bank on an unsustainable business practice, but man.. It's not something I can do in good faith to my customers.
-Phil
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