All this for one game?
I was in advertising and did campagins for quite a few game cafe's. The ones that specialized in a "hot" game at the time (like Halo), did great, then fizzed out.
The fact that home consoles and even sim cockpits are easy attained, makes these types of places hard to keep open for long. Arcades are a good example of how the market is dry.
Add to that a so-so game like GT5, a niche market of sim players vs. arcade players, and cost of gear, it seems the odds are gainst you. People who want a sim are going to be frustrated with not being able to have "thier" tunes, "thier settings", and whatnot. People want to play Outrun are going to be turned off by the more sim like feel.
What market are you trying to capture?
If I want to play a sim with poeple, and have good coffee, well I pick up some joe, get into my home made sim pit, and turn on my bluetooth, and invite some friends into a lobby.
A gaming cafe that includes race sim type games is still risky, but has potential for much more life. Also, going PC based, with PC sims gives you much more flexablity, and much better sim game than a PS3 and GT5, and not to mention better networking.
Seems most posting on here are very supportive, so I figured I would chime in on the downside of your idea and give you some things to think about. Please dont take it as an attack.