ROI is with current rate of ethereum is 5-8% only, We are the miners and currently having setup up and running, for huge investment you need to be focused on what you are going to mine and when you are going to sell those crypto.

Just setup small setup and calculate the ROI for that and than move forward to catch the unicorn.

For investment in BitsPay Inc please follow the thread (https://bitcointalk.org/index.php?topic=2201018.0)

Happy Mining !!!

BitsPay Inc.