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.
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I'm only talking about the money people are willing to spend on fees. Whether it is one person spending a lot or lots of people spending a little, should not matter the economic impact is the same. I don't think it can be easily gamed by the users, unless they want to advertise their coin by spending money on transaction fees. They will run out of money eventually. People can either sell their coins or use them. Using them costs money and if they do, apparently that has more added value. People only spend money on transaction fees if they benefit from it in other ways.
Also the page is called "coinmarketcap", not "coinfeecomparison".
You're right about that. However, I would like to see it displayed to make a more fair comparison.