How much does a sol validator make?

Could you elaborate on the earning potential of a Solana validator? I'm curious to understand the factors that influence their income, such as the amount of stake delegated to them, the current state of the Solana network, and any potential rewards or incentives. Additionally, I'm interested in knowing if the income varies significantly over time and what are the average earnings one might expect in a given period, say a month or a year. Understanding these details would help me assess the financial viability of becoming a Solana validator.