Every founder should know what their startup is worth, even if they have zero plans to sell. Imagine you're running a SaaS doing $1.5M in ARR and $500K in profit. Business is good and you're paying yourself well. Then one random Tuesday, someone emails you offering $3M to buy the company. Sounds pretty exciting! But is $3M a great offer or should you counter at $5M? Would another buyer pay $6M? Is $3M actually more than the business is worth? You'd be surprised how many founders have…