And they all have to prove themselves each week. Drinking is also related to the gambling. This is for a lot of different reasons. Some bowlers need something to keep their minds off the game. Believe it or not some people bowl better when they are hammered.
Some bowlers drink to celebrate.
They won some money so they buy a round of drinks for their team. And others drink because they lost. They use it as something to settle them down. Emotions flare up when money and pride are on the line. Alcohol is the answer to that for many bowlers.