i dont think this is feasible business wise if you were to open a facility catering only to GT5. Yes it would be a great idea if you already operate an arcade and add this as a section. But all that investing just for GT5.... you'll shut down in a year with debt.
edit: cman333 hit the nail on the head.
if you really want to do this because ur passionate about the game, then better thing to do is lease a place for other business purposes and have this club going on in the off hours. If it builds interest and you see it making a profit, then slowly convert. During peak season you can lease it out for other purposes.... lets say... MJ gathering for the clais'