Hello,
I have some questions about the staking and I'm thankful if anyone answer to them by their numbers:

1- Why the price of the staking is variable and not constant?
2- Which coin is good for the staking?
3- Is https://www.stakingrewards.com/calculator/smartcash/ logical? You bought $214.16 of this coin and earn $3,028 per month!!!


Thank you.