It's a little difficult to do this on smashboards, someone should contact me on MSN or something...
So there are basically 3 options:
a) I rent the only bus, and about 15 stockholmers and an unknown number of foreigners will have to fight for the 10 spots available.
b) There are enough foreigners (about 10+) flying to Stockholm Skavsta that you can rent your own bus.
c) At least one of you foreigners who fly to Stockholm actually come all the way to Stockholm, rent a second bus, and drive the rest of the Stockholmers + a few foreigners from Skavsta.
I probably should clarify that the Stockholm Skavsta airport is about 90mins of driving from Stockholm towards Gothenburg.