I feel its a good idea. I have been thinking on similar lines. The thing i could come up with was to make it a pay site.
In the months that i used to visit Pakwheels as a guest and when i signed up, it used to be a very good and informative site. Serious people with car knowledge, and I am not talking about having been brought up on Pakistani assembled Toyota or Honda and arguing over which is the best, fastest etc etc car, in what is after all just an economy sedan.
There are too many threads now about Toyota vs Honda, Civic " Reborn" about the new Corolla about guess my car etc. What
s more the site seems to be more about selling your personal rubbish, second hand clothes, perfumes, new and old mobiles etc than about Automobiles.
I think it has been discussed on another thread too. I think there is nothing wrong with exclusivity.