AngelStorm Deluxe

I have friends who I am trying to introduce to Second life here on campus, however it will not let them create accounts due to household limits (I guess too many accounts have been made using the same IP since we all share the same internet service) Why would they limit this especially when so many public internet access points are used by many people? Is there any way around this? Or are my friends who do want to join, just SOL until they go home for holiday?