Corrected your line.

To this day I have yet to understand why most miners have zero understanding of the word 'variance'

Variance means UP and DOWN.
So you are not getting paid less, you are getting paid, varying above and below a higher amount, with an expected higher return.

Just like every business on the planet - some higher and some lower times/seasons.

And to state the obvious, that is exactly how bitcoin works - no matter how big or small the pool is - blocks are random with an expected average time.

Since you compared it to something that is not even comparable, I'll use the same faulty comparison:
Or even as employees in any good company, your wage depends on how the company performs (and how you perform)