I guess it all depends on how much you fold on how much hardware.
I have seen many many people start folding all gunho, buy tons of hardware and then they stop folding.
Just because the new 10xx sips electric, out of 3200 new folders, I am sure many are not new, but still how many are folding on older hardware? We do not know.
When I am in full swing in the Winter I have 250+ cores crunching and several (4 to 7) GPUs either folding or BOINC GPUgrid.
This year mostly Maxwell since I got rid of my 660Ti cards and upgraded to GTX970 to 980Ti.
I like to run a lot of hardware to heat my house in the Winter, my electric bill does go up and it is more than 80$
I like to buy used hardwaare, I can buy more of it and why not put it to good use?
So time will tell. Give it a month or two or three and we will see how well they are still doing.
And 80$ a month is a lot of money to some people. Many live paycheck to paycheck