Resale is low. You need to get tokens from Karachi i order to keep things streamline. If you get the tax tokens from Isb/pindi etc Sindh excise wont count them and when someone tries to get the car on his own name e,g next owner, they would ask for submissions of previous tokens.
Secondly, Karachi driven cars are rust prone due to sea waters proximity so people in general avoid it.
In general I feel that if you getting car in 20-30 k below market and in mint condition, go for it but keep in mind the once a year hassle of getting the car tokens done from Khi.
Khi registered cars in Isb/pindi etc are either mint or junk! I don't see mediocre cars from Karachi!
Your turn.