The exchange of CS:GO and Dota 2 skins brings a lot of income from digital items. In 2016, the estimated value of the goods sold was about $7.4 billion. To trade skins, people often use third-party websites, such as https://dmarket.com/promo, where the promotion is currently taking place and you can buy a game skin at very good prices, so I advise you to hurry up, since this promotion will last until mid-January. This site uses its own cryptocurrency to regulate prices and offers fair trading for both parties involved in the transaction.