I have some done some calculations in regards to leveling pokemon from 80 to 100 at Dragon's Den and along with that calculated the amount of money one would get as well.
*Note this was done with Membership Activated
*Also I am just showing the final product not all the nitty gritty deals to obtain these numbers
As shown here in an hour at dragon's den, assuming ideal encounters (4 encounters/faints per min) and avoiding travel time to pc, the average player at dragon's den would make roughly 75,000 poke dollars. If someone would to spend all day, lets say 12 hours grinding at dragon's den and nothing else, they would amount 900,000 poke dollars. Assuming the possbility of a good rare or shiny appearing within the 12 hours may net you around 1,000,000+ poke dollars.
Assuming not membership it would be roughly 37,500 poke dollars an hour and would take around 4 hours of grinding at Dden to buy a membership.