As far as I know, you can run multiple sites from one installation - I can't see why this would need more than one licence but I may be wrong.
I think it would require a dedicated server and some rewrite rules for you to direct each domain to a different template set. Then you could run it all from a single admin panel.
I think it would require a dedicated server and some rewrite rules for you to direct each domain to a different template set. Then you could run it all from a single admin panel.