This (as well as the amount of transactions) can be easily gamed. Also as long as miners get paid transaction fees AND coinbase transactions, costs per transaction are actually much higher than actual fees.

Proof of Stake and Consensus based systems also have it MUCH cheaper to confirm transactions which is reflected in lower fees. Comparing fees and volume only would make sense for the same class of coins (e.g. PoW coins) and STILL lead to some very strage things.

Also the page is called "coinmarketcap", not "coinfeecomparison".