No kashif bro I m not saying this thing, it is a charming and prestigious job but PO can be posted any where in Pakistan, while IS and ziledar are often BS14 and BS 16 grade jobs and even their transfers are rear and almost in their own district. Salary of PO will be about 26 while in training and when posted it would be round about 38. It's a rough guess, better to ask about salary from anyone in service.