Couriers avoid posh areas in panaji due to some reasons

One of the trends the domain investor, noticed is that couriers in panaji, sometimes avoid visiting the posh areas of panaji for delivery of the different items.
If the person is not at the mailing address that is being specified, and is in a less posh area, the courier will tell that he will deliver the item in the middle class area
One reason is that there are more deliveries in the middle class area which has a higher population density, so the courier does not want to travel to other areas spending time and money.