People will argue over anything. Like if it’s ok to snap a carrot in half at the grocery store, leave one half there, and pay for the half you need.
I don’t see a problem with this at all. Food is expensive and you should only take what you need. I do this with bananas all the time. If the best bunch has six bananas, I’ll take one off, and only pay for the five that I need. I’ve also taken five single bananas before when the singles were the best-looking.
Call it unethical if you want, but I call it brilliant!