Separate point when you are starting out in some business the easiest and first customers you get are the ones that nobody else wants or gives bad service to because they are irrational and unreasonable. (Keep that point in mind..)
There is an example with Zappos of someone being able to spend an entire day pleasing one customer. That is entirely unreasonable and except for the story and publicity value of that event makes no sense at all since anyone who wants to spend that much of your time is not going to be a customer that you (probably) want long term. At a certain point you simply have to (in business or life) walk away.
https://www.refinery29.com/en-us/2016/07/118020/zappos-custo...