We all know testnet coins have no value
yet mining a single testnet coin today would cost over $40 USD if you rent hashpower. Even if you have your own S19 rig the mining reward is so small it would take at least 4 days to mine a single tBTC. I found a testnet3 mining calculator which appears to be the only one that exists specific to Testnet3 (tBTC).
https://buytestnet.com/bitcoin-testnet-mining-calculator.php
The market is so lopsided right now, you can buy them for a tiny fraction of the mining cost largely due to the narrative that testnet bitcoin has no value. The main reason seems to be the fear of a reset, yet a reset hasn't occurred in over 10 years.
Once the current supply is eaten up and market catches up to match mining cost the returns would be better than a memecoin!
Post any other testnet mining calculators you can find in this thread!