For me the answer as of now is none. The reason is that the reward to benefit ratio on most networks that use staking is to low compared to similar alternative investments outside the crypto scene. For me, a 20% APY can be obtained in a number of stocks that are volatile, yet much less than crypto. Smoother ride, less risk...
Name a stock that pay more than 20% in dividends and its price is not as volatile as above crypto (outside current bubble)
It seems to me that you are confusing the quantitative passive profit with the qualitative profit from a well-selected investment in a stock company. Is this >20% is from price grow than i must say that average stock trader/investor earns 2% annually. Experienced investor earns more, obviously, inexperienced loose life savings. Average 2%.