You need to understand how staking works for the token you stake. On Hive (actually Hive-Engine), if we talk about a tribe token like LEO, writing content for that specific tribe and curating with the stake are usually the main ways to get more tokens without buying more. Some tokens distribute dividends or are growth-oriented (they grow their value instead of distributing rewards). You need to make some research before you stake a token, or ask around, to understand what to expect.