Actually, in the United States, it is common for a customer in McDonald’s to return the tray after the meal. Malaysians, somehow, do not generally have the DIY spirit. Most just leave the trash and trays to the restaurant staff. However, majority of Malaysians eat vegetarian food for religious reasons. The self-service vegetarian restaurants are probably banking on the ‘Buddha factor’, as understood from the Chinese saying:
Even if we don’t give face to the monks, we should give face to the Buddha.
The price? In the restaurant located near my workplace, a simple meal costs just RM2, and Chinese tea is provided for free. That is really cheap…