$30/m seems quite reasonable. If a business can't afford $30/m you probably don't want them as a client. A single support ticket a month will kill your margins.
Too true. As an SBO with many other entrepreneurial friends, I regularly have the conversation that they need to spend money if they want to scale at any reasonable rate. I generally don't blink at software <$50/mo, even up to $100/mo if it's solving a problem I need and gives me time back, and happily more if it will make me money. I don't really bother price shopping - it either works, or it doesn't, and it's "reasonable".