But what does the notional got to do with the fees? It ain't like the index futures shot up in the last decade because of CME. These greedy MOFOs would have raised the fees whether the notional is valued at $50k or $250K...regardless.
Do I have to spell it out for you?
Lets say you trade $1 Billion total notional per year in ES. You would have traded 8,000 contracts/ round trips for the year when ES was trading at 2,500 back around 5 years ago paying $28,800 in total fees for the year when all in fees were about $3.6 per r/t.
Now ES is around 5000 you only have to pay for 4,000 round trips in order to trade the same $1Billion total notional, but this year you only have to pay a total of $16,000 in fees at a higher $4 per r/t all in fee.
The total fees paid from your account have fallen by 45%.
Now official inflation in that time has been say 25%. So you probably want to be trading $1.25 billion in notional these days so your profits keep up with inflation. But you are still paying less in commissions in total even if you up your size by 25%, so $20,000 in total fees for the year.
CME's total dollar fees in how much they make from you has gone down even though they are charging more on each contract compared to back then, its still not enough to compensate for the fact you able to reduce your volume and trade fewer lots to make the same level of dollar profit.
This all due to the fact the S&P 500 has gone up faster than inflation and also faster than the all-in fee you pay, which you can thank your clearing firm and broker for.