You're only accounting for one kind of expense here: short-term, visible payroll costs. But Shyp's whole goal here is to create a brand built on amazing customer service. That's determined by things that are much harder to measure.
Making decisions based only on the most visible numbers is a business version of the Streetlight Effect[1]. If we want to do this right, we also have to ask things like: What's the expense of increased turnover? Of lower morale? Of poorly trained employees? Of decreased service quality? Of worse word-of-mouth advertising? Of increased advertising budgets needed to compensate?
That's not to say that cheap is never the way to go. But if we're going to use numbers, we should use them well.
[1] https://en.wikipedia.org/wiki/Streetlight_effect