But then they are getting their wages anyway! Those that will be with us next year know they will be playing PL football next season. Those that will be discarded know they won't. No real incentive for them to put it in on Saturday either way. So they didn't.
This!
It is often the case that , despite a noisy, enthusiastic start, the atmosphere drops off and the noise diminishes when it is apparent that the players are already on the beach as was clearly the case on Saturday. That had the vocal support at the start and the players' apathy eventually...