In society money is the root of happyness.
In eve this is also true but isk comes from the ore that the miners mine.
Some will say that the manufacturers are the ones who make the isk.
This is in fact false.
The miners are the ones who mine the ore which in turn is made into different items by the manufacturers.
Then the items are bought by everyone from other miners to other manufacturers.
This proves that the miners are indeed the root of happyness in eve