I don't think $4 a month is a lot to pay for a not-so-tech-savvy small business looking for an easy way to have an online presence, though of course there is only one way to make sure.
I’ll channel my inner patio11 and say that a business that cares about saving $9/mo vs Squarespace isn’t going to be a valuable or long-term customer. Pricing is about defining who your customer is, but also who your customer isn’t.