It's just a case of too many hands fetching the scarce number of goods.
Total goods (average number of cars) produced in a month = 12,000 (based on Annual sales of FY10). That is a fact.
Let's say manufacturers increase price by 50% on average!
If there are only 12,000 people in Pakistan who want to buy a car during the month of let's say September, then the increase in car prices will maybe affect their decision to purchase, and actual car sold will be let''s say 10,000 in that month and beyond.
However if there are a million people that have the need to buy a car of their own, then even if 988,000 decide NOT to buy the car at such a high unreasonable price, you just need 12,000 out of a million people who will buy those cars in that price to serve their need. Hence manufacturers not only are able to sell all those crap cars that they produce, they also get the 50% jump from the price increase.
Some serious demand/supply mismatch