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.
Another result of gambling is anger. These guys get really serious about this stuff. I ve watched a lot of guys get pissed. And this actually happens all the time. A guy misses a spare.