If you have just launched a start-up, you have likely spent a lot of time planning and building your business. Part of that planning process involves, or should involve, deciding who will be on the receiving end of your marketing efforts. Your products might appeal to a large group of people, but it doesn’t make sense to try to market them to everyone.
You obviously want as many people as possible to know about your business, but the more potential customers you want to reach, the more time and money it is going to cost to do so.