Originally Posted by
ESpen36
No. You can have 0 stickers and you still can clear with no effect on your priority.
However, as others have said, having 0 stickers WILL add to your check-in time at the airport because you will have to buy the stickers before you can receive your boarding pass(es).
So, it's a good idea to have enough stickers in your account to cover the upgraded segment(s) BEFORE the OLCI window opens.
Of course, check in time has no effect on the upgrades.
However, if upgraded with enough time before the flight, you can buy the upgrades. I think it says you to allow 2 hours for them to post.