Actually, what the unique IP address option gets you is that your domain name is assigned a unique IP address. That is, that no other site is assigned that IP address.
The usual mode for shared hosting is that there are tens or hundreds of domains sharing the same IP address and that the "host:" header in the http request is used by apache to determine which site is actually receiving the request.
This is distinct from the idea of dynamic IP allocation. I'm pretty sure that none of the DH servers work via dynamic allocation by a gateway.
But you are correct in saying that you need this to run SSL with your own cert. You would also need it if you need to run anonymous ftp. There are a couple of other servers or protocols that would require you to have a unique IP, but most people don't run those here.
Free unique IP and $67 off with promo code [color=#CC0000]FLENSFREEIP67[/color] or use [color=#CC0000]FLENS97[/color] for $97 off. Click here for more options