Staking is like trading sometimes - if you know how to do it right, you will earn a lot here 
If you are staking all you have without any knowledge and experience - you can even lose your money.
Good knowledge and skills indeed for the crypto market everytime. That means if you want invest or trading then you should skills more for searching a good coin. Same thinking if you can got a good coin for staking then it will be profitable after long time away. Otherwise you money will be loss if you have to invest a fake inactive project. If you are staking all you have without any knowledge and experience - you can even lose your money.