Indian Railway — What is the need for PQWL

Address:

Mumbai City, Maharashtra

Why there is PQWL while booking rail tickets. I think its better to have only one waiting list and that should be served only on first come first serve basis. I think it is better for normal public and for Indian railways as well. Anyways tickets booked against PQWL very rarely gets confirmed. So I dont see any use of this quota for normal public.
I think rather than making system more complicated, Indian railway should work on improving online ticket service. (There are lot more better things to do, than complicating system and making fool out of public)