What are some of everyone's personal guide lines or rules on when you choose to use stickers to upgrade or not? For example, I'm on an early flight from DFW to ORD on Saturday morning and the plane is literally empty. I think I counted 21 seats taken in coach and about 50% left in A, F, P as well. I'm pretty sure I'll get my upgrade if I request it, but I'm thinking maybe to not burn the stickers since I most likely won't have anyone sitting next to me in coach. The flight is ~2 hours long and requires 2 stickers. I currently have 30 stickers.