One of the best times to sell your startup is when you have absolutely no reason to sell. Business is growing and customers are happy. You're making $500K a year in profit. And you've got enough cash in the bank that you're not worried about next month's payroll. That's a pretty great position to be in. Now imagine a buyer comes along and offers you $4M. You can take the offer seriously without feeling like you need the money. You can negotiate harder. You can walk away if the terms…