It's a bit like the Sharks playing games in Adelaide - it's for the money not because anyone's creating a franchise there.
Sorry, I overlooked this bit the first time around; I think the difference is that with the Magic Weekend, most of the fans in the ground have travelled to watch their teams.
With Adelaide, I would imagine the vast, vast majority of the crowd are locals - so even though the game(s) are both there for the money, I think the Adelaide game is a more accurate guage of local support for the sport compared to Edinburgh and hence it's quite useful in that respect.