[compay]

> I see it as a type of scam against the employer, though.

That's definitely sometimes true. But it depends - when I was in college I used to go to a bar (Redbones in Somerville, MA) where the owner had a policy of letting the bartenders offer a certain number of free drinks and appetizers to favored customers at their discretion. He did this because he said it meant more loyal customers, which helped both him and his employees. I definitely spent a lot of money in that bar and always tipped heavily because of the great service. Despite all the freebies I got, I'm sure they turned a well-deserved profit off my business.