It is expensive to open new restaurants and the only place most can succeed is in central city locations, but the City Centre increases the costs further. (78% go bust within the first year).
The problem in having a village restaurant is that you have a limited number of customers and once they
have patronised the restaurant there is very little chance they will visit the same restaurant more than once every few months.
If 4 restaurants open four different style restaurants(e.g Greek, Italian, Chinese, Turkish) in four seperate out of town location. Every two weeks they could swap locations, this would increase interest in the restaurant, locals would have variety, and it may increase patronage (you have to go to the Greek restaurant this week as its not going to be there next week).
Cost will not increase, the same equipment is used in the restaurants and the customer base increase 4 fold.