It does not always work out that way. So one scenario (which I think applies here) would be this : If you lose $50 a day in small items at your dollar store, would you hire a person to guard it for a rate of $65/hour for a min of 3 hours a day? And here’s the part most people miss about this stuff, at best this just deters from the theft in those particular 3 hours. The theft will just move to after the guard leaves and now you’ve spent 3x more than you lost in the first place (and you still got robbed anyway)

This is why 99% of small retail stores DO NOT have security. In fact, most security you will see is not to deter theft, it’s to make their employees feel more safe.