This is tough question. After we sell bitcoin it will provide income if you buy it at the lower price and sell it at higher price. BUT ... it is a zero sum game, because after you sell bitcoin, you will not have bitcoin anymore. Bitcoin is a growing space of innovation and there are business opportunities that also include risks. There is no guarantee that Bitcoin will continue to grow even though it has developed at a very fast rate so far. Investing time and resources on anything related to Bitcoin requires entrepreneurship. There are various ways to make money with Bitcoin such as mining, speculation or running new businesses. All of these methods are competitive and there is no guarantee of profit. It is up to each individual to make a proper evaluation of the costs and the risks involved in any such project.