2. Actually the high price for imported cars was fixed before Proton to reduce gas-guzzling cars from being imported. Thus cars with big engines are taxed (import duty) by 300%. Other cars are also heavily taxed to reduce import of petrol.
3. When Proton was introduced the price fixed was lower due to lower tax being charged. The buyers profited from the lower price so that those who could not buy a car before could now buy a Proton car.