dell takes bitcoin now too

while watching the video the point came up of earning more off selling off the capacity instead of investing in tech.
I don't see how this could be so. I must be missing something.
For example if you are selling off power at X you are only profiting from X
By comparison if you are selling off power at Y (y is cheaper power) to tech company, tech company is also seeing high ROI and jobs, also they bring in their families etc.
The positive economic effect seems far greater if you sell off to tech. Even if risky
The fact remains like the one gentlemen said in the video you never sell it all off to any one thing. Basically he was trying to say you diversify the capacity.