There are two answers to your question.
Most password cracking operations target a database of user accounts in bulk. As long as the hacker is not targeting your friend specifically, they should be fine.
If your friend is the target, one or two successful hacks could make their other passwords vulnerable.

Maybe change it up a bit? Decide that when you drink, you will only drink premium beer. Refuse to buy anything but expensive beer that is not on sale. After buying a few of those, your desire to save money will begin to heavily influence your desire to buy it at all. This has the added benefit of making all of the cheap beers seem sub-standard and not worthy of purchase.