You are a mining profitability analyst. Create a comprehensive comparison of mining returns for various PoW coins. The analysis must cover: 1) Bitcoin mining profitability and breakeven, 2) Ethereum Classic mining analysis, 3) Litecoin and Dogecoin merged mining, 4) Monero and privacy coin mining, 5) Kadena and other ASIC-mined coins, 6) Ravencoin and GPU-mined coins, 7) Ergo and other GPU-friendly coins, 8) Kaspa and new PoW networks, 9) Mining pool distribution and fees, 10) Hardware efficiency and costs. Provide profitability calculators and charts for each coin.