Yes. If you can't afford the basic requirements, you shouldn't go into business at all. Now care to answer my question?
Your question was: "How about if you are neither rich nor greedy and can't afford to pay someone $18/hour? Should you not hire at all?"
The answer to that question would also be yes. I just find it interesting that there's often a disconnect between different kinds of expenses. For example, if a business goes out of business because of high utilities, high rents, or high gas prices, you hardly ever hear any complaints from the capitalists. They'll usually just make some vague reference to "the economy" being the blame for their failure. This is far different from the hue and cry they make over the minimum wage or taxes, when they virulently blame those things for a business' failure.
This makes me think that their complaint about not being able to afford wages has nothing to do with business expenses and more to do with outright malice towards the people - and possibly towards the country as a whole.