Brother Sarkaar shared a very informative post. To add my personal experience here, before buying Suzuki Wagon R VXL, I owned a 2007 model of 660 CC Suzuki Kei (JDM import). According to the export sales certificate given with the car, the car dealer had bought the car in 2011, for USD 1,000 only (PKR 91,000 at that time) and sold it onwards in 2012 at PKR 850,000. I don't exactly remember the taxes and custom duties paid on it, but even if it were PKR 200,000, the car would have costed the dealer about PKR 291,000 only. Hence, the dealer made a profit of almost 300% by selling me that JDM. As the car was imported in Pakistan in 2011 and registered in 2012, I had to pay penalty of previous year on registration as well.
Even after that bitter experience, my elder brother was hell-bent on buying a JDM car again, but I bought local Suzuki Wagon R VXL, and have been satisfied with it so far, Alhumdulillaah.
So, in a nut shell, Pakistan public is being ripped off while purchasing both local as well as imported vehicles.