How much is Ethereum proof of work?

Could you elaborate on the cost associated with Ethereum's proof-of-work consensus mechanism? Specifically, I'm interested in understanding the economic implications and potential expenses related to miners participating in the Ethereum network through proof-of-work. Are there any significant costs associated with mining Ethereum blocks, such as hardware investments, electricity consumption, or other operational expenses? Additionally, how does the current market value of Ethereum affect the profitability of mining?