That is definitely a good way to do it if you're going to go solo, but once you grow enough/depending on the product and market and who your competitors are, yo

That is definitely a good way to do it if you're going to go solo, but once you grow enough/depending on the product and market and who your competitors are, you absolutely CANNOT wait a week to respond to people/make sales pitches. If nothing else, a competitor providing the same service with an always on sales department and the ability to respond to important clients in hours rather than days will smoke you. So if you know you want take this approach, make sure to do your market research beforehand and see that it's an economically viable approach. It works great for something like Bannerbear where the clients can just find another way to make images for a week or so. If it's something crucial to client deployment of their own products or if you're B2C, less so.