I quite understand your point here. A good business plan and the kind of business you are into could determine your returns not how big or how small your business is but how much efforts in terms of planning, advertising and others.Yes, it depends how hard you work towards that business, business doesn't determine how small it is, but determined how plan you make before starting up the business, so business size does not mean that the profit will big or small, but what matters is how you plan it to be.