Hello Dear @revisesociology
I never did the maths like you did I just saw the benefits as a well lit and comfortable place with fast internet and free Tea/coffee.
However this is an interesting point of view for sure and would prompt a lot many people to take up this option.
I invite you to join the $10000 Leo threads quest that is a big opportunity for all hive users .
You can join it here
Once you join think about what all you could be doing with the extra $10000

You can read about the steps involved to join the quest here
Do let me know in case you need any assistance in this regard
There is very little time left as the Quest starts on April 30th so please act fast