What makes you sure that the competition does not grow too big since its such a profitable business?
I've been mining and observing crypto since a long time - the profitability decrases over time but not dramatically :)
It's quite stable.Check out 30 day graph at: https://www.nicehash.com/profitability-calculator/nvidia-gtx-1080?e=0.1¤cy=USD
edit: Oh my, no, why do you ask?:D
I heard hes doing a lot of flagging :)