In general, it is not advisable to limit your prospective consumers because it could mean limiting your income too. It's like you're building your own wall between you and the customers and that's not something a good businessman will do. Why target a smaller market when you can have a larger one? More people, more opportunities, more profit. I recommend you to make your own survey and study to know what is more profitable, favorable and effective for your business. Choosing your market is hard to decide with because this will determine the growth of your business.