Every business owner has had one. The client who pays late. The one who changes scope constantly. The one who sends emails at 11 PM expecting a response by morning. The one who makes your best employee want to quit. Bad clients don't just feel bad. They cost you money. Often far more than you realize. Beyond the Invoice When you look at a client relationship, the first number you see is revenue. They pay you $50,000 a year. That sounds good. That's a client worth keeping, rig