No, but there's not much sense sending like 0.001 SBD
Did you read my mind?;-)
I would say, the investment worth pursuing until the daily profit drops below 4$ US since its an after tax number and the objective security here to get your money back is zero (nothing personal...). If I only had more than 0.001 SBD, I would send them to you now. This way you'll have to wait a few days...
What makes you sure that the competition does not grow too big since its such a profitable business?
edit
One more (important!!) thing: You are not the person who is also @berniesanders, are you?
I've been mining and observing crypto since a long time - the profitability decrases over time but not dramatically :)
Check out 30 day graph at: https://www.nicehash.com/profitability-calculator/nvidia-gtx-1080?e=0.1¤cy=USD
It's quite stable.
edit: Oh my, no, why do you ask?:D
I heard hes doing a lot of flagging :)
No tipu is not berniesanders