i ordered 2 d3 november 20-30 batch each costs 1800$
iam little bit worried that i cant get my roi 3600$
but i have free electricity what do you guys think about it?
I think you'll find out exactly how "free" your electricity is.

Also, remember that you'll probably be able to re-sell your hardware at some point. Between mining and resale, you will probably recoup. Eventually.
M