I will never understand how that works, but then those "companies" are basically illegal imho (not registered as business) and operate on a scale that makes most people laugh.
If you want good return on investment, you must invest Heavily. And put up some more money to get infrastructure save. And have admins etc. in the calculation.
US maybe a ad place for that
Lets hope the final negotiations for my data center go well. Place for 84 Racks for mining - all in all 1344 computers full of cards Not taht I start with it - it is profitable with 16 computers in it, and we wil have 32 by September.