Sermons are off-putting.
Humor almost never is. Going out of business is off-putting too. And that's what happens to liquor store owners who don't take carding seriously. The way this big bad world works is that liquor store owners get penalized when people who aren't supposed to be buying alcohol give it a go anyway. That's because, in an odd situation of double-liability, it's just as illegal to sell alcohol to certain people as it is for the people to buy it.