Hello Kumabjorn
You can achieve what you are looking for by going with Fon (
http://corp.fon.com/en/), one possibility is to get a Fon server like the Fonera Simpl and you can share your router.
What you get:
1 - share your broadband to all other Fon users for free;
2 - if you decide, you can sell your broadband too to non Fon users;
3 - wherever you go and there is a Fon server like yours, you get wireless connection for free too… and they say there are millions of them all over the world.
In Portugal (my country), all clients with fiber optics access from the biggest cable provider ZON (
http://www.zon.pt) have their modem/router’s with this possibility, so I’m now writing you this on my beach house in Algarve using somebody’s else Fon wifi access for free.
Best regards,