Because every govt official is a shikari there. No businessman wants to be noticed or become high profile.
To tell you the truth, Sialkot suffered from the same which is why it was forced to become self sufficient.
Airport land was earmarked during Zia era. ..but after Zia, pmln refused because they feared it would take away traffic from Lahore. Benazir refused because she feared they couldn't commandeer the customs dept like Karachi customs.
The remarkable unity in the chamber of commerce is amazing.. shows trust in it's own members.plus they have the courage to take bold decisions and spend money.