The trick to growing your startup is learning when to say No to customers. This might sound counterintuitive , because when you're a startup, you're so desperate for cash that you are happy to take money from anyone and everyone who is willing to buy your services. However, you will soon learn the hard way that some customers are just not worth the money they pay you. This is especially true of customers who want a free trial, but will refuse to pay for your product. They drain your time, suck away your energy , and stop you from focussing on growing your company.