What do you mean "longer than they should"? They have a right to be there as long as they want.
I like it when vouchers are given out. I can go to other bars and drink w/friends I am cruising with & use my vouchers or drink with Pax I have gotten friendly with on board. Also, I can take a glass of wine to the MDR.
As far as the future cruise certificates, they are no good to shareholders, discounted cruises or anything else RCL can think of.
O F C'er