Oh! Just hadn't heard it called a Sandwich before. lol
Maybe the better question is..........whats best room to ask for to upgrade to?
I'm Gold at V/P, and usually get a High floor, and TI view upon asking.
Thats what I would ask for, and No sandwich needed. Just smile, ask nicely.
IF they have available? Will probably give to you.
If not available? They won't.
Keep your $20 for the casino. But thats up to you.