Here in southern Germany the checkouts are always very slow and crowded and always understaffed. Basically a normal situation is to have 20ppl wait for a single checkout. Then they begrudgingly open another, take 5 customers and close it again only to have the same thing repeat. I'd be happy to even pay extra just to have access to a speedier checkout self serviced or not and not have to waste half of my day waiting for this world's worst service.