I like your thinking although I absolutely despise what you're saying.
This could actually be 100%. If UPS is pure evil they could very well deliver new orders immediately and tell everyone *cough*press*cough* "SEE, WE'RE BACK TO NORMAL!!11 NO EYJAEYJASMTHVOLCANO PROBLEMS ANYMORE!"
This is what happens to the passengers also. The new tickets are prefered. Those that waited have to wait longer.
I think this practice is "normal" and will be applied to our shippments also....