My 2.6k rig (1080 ti, 1080, 1080, 1070) brings in 6 euros a day. That's ROI (or BE or whatever you want to call it) of 416,6666666666667 days. Without talking about the electricity costs - how high or low they may be.

I can't really be positive about those numbers. Don't know what planet you live on, but mining conditions at this time -and we are ALL in it for the money, even those who say they are not- are terrible.