The most expensive email a freelancer gets is three words long: "one quick addition." It lands at 11pm, eats most of an evening, and nobody ever gets paid for it. Run the math on a real job. A $4,200 coffee bag redesign scoped at 42 hours is $100 an hour. Say the replies and a pushback email you rewrite twice take three hours. That's $300 handed over, from one email, from one client. I've worked with a lot of freelancers, and the leak is usually in the same place. Every client is a chain:…