Can you make money running a Solana validator?

Could you elaborate on the financial potential of operating a Solana validator? Is it a viable source of income? If so, what factors contribute to its profitability? Do validators earn through transaction fees, staking rewards, or both? What are the initial costs involved, and how do they compare to the potential returns? Also, is there a significant competitive landscape in running Solana validators, or is it relatively accessible for newcomers? Understanding these aspects would help assess the financial feasibility of operating a Solana validator.