Man City's failure in the Club World Cup is a surprise because they were among the favorite clubs. However, this situation brings both advantages and sadness. If counted, Man City has played 61 matches this season. This exceeds the normal routine, meaning there is a possibility of negative effects from this. So, going home gives them a better rest period. They have also received a substantial payout from this tournament.

According to the sources I read, they earned a prize of around £37.8 million. Although it's not much for transfers, it has helped Man City's revenue. Currently, the only EPL team left in that competition is Chelsea. They will face Palmeiras in the quarterfinals.

Source: https://www.bbc.com/sport/football/articles/cew00782yw2o