Earlier quoted context omitted.
Good luck with that. The customer is always right. You start doing stuff like that it will bite you back 10x.
> The customer is always right. This adage only works when marginal value of a customer is high, and monetary preferences aren't utterly dominating customer's thought process. Business dealing with necessities, or ones where demand outweights supply, aren't like that - that's why in a grocery store, customer is trash. There's plenty more where he/she came from.
The customers tend to be brand loyal, and the lifetime value of a customer is very high (family with 2.4 kids and a dog is minimum $10k/year in gross sales), so when you start banishing customers for doing things that they may not even realize that they did, they will loudly tell everyone they know what a bunch of assholes you are! The $25 roast will cost you $500.
If I stop shopping at a local grocery that uses a loyalty card for two weeks, they will immediately begin sending coupons worth 10-20% of my average transaction value to get me back. The ROI of giving away $20 at a pretty low margin implies a high value.