Certainly costs rise as activity increases. However, there are levels of advancement. We are nowhere near 100% usage on Hive. 70K per day wouldnt even get things breathing hard.
There's no logic in your analysis.
Actually math is the logic. If it cost $1M to run the chain, and there are 100K transactions, the cost per transaction decreases with an increase to 1M. The cost declined by 90%.
Of course, that hold true until another level of expansion is required, which drives the total price up. This is where scaling enters.
Finally, there is a point, you are right, where it becomes non-feasible to have each OMG and yes sir on chain. That is where less expensive data storage can enter.
This is a network. We know over time that costs decline and performance goes up. This is computing 101.
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