The market cap in cryptocurrencies is quite low. This makes it really volatile as is easier to have big pumps and dump, this makes it really risky but also really profitable. Another factor to take into account is the devaluation and inflation of FIAT and the crazy negative interest rates on savings. As everything the higher the risk the higher the reward, but keeping in mind you can lose a lot. Finally, some risk management techniques helps quite a lot into managing when and how much to buy/sell.