Most of you might not recall but did you know that it wasn't the miners who made most of the money during the California Gold Rush?
Who was it? It was the merchants who sold the supplies to the miners that reaped most of the benefits. One of the richest men in California at the time was selling supplies for miners at huge mark ups.
Some Gold miners made a decent profit but it was only because they showed up early. But the miners who arrived much later actually made very little money and some even made a huge loss mining the gold.
It looks like Bitcoin mining is becoming exactly the same. The only individuals making money right now are the ASIC manufactures and the manufactures of PSUs. Like Bitmain and Corsair/EVGA.
Some Bitcoin miners made very good profit if they started mining back in 2013, for most in 2014-2015 resulted in very little profits or loss.
Don't know if it's fair to put the PSU makers in this. They price them for computers not miners, we are not a big enough segment to have PSU's based on miners use. The exception is a few companies take server PSU's and sell them specifically to miners, yes those miners do effect price.
GPU day's miners did kinda effect GPU pricing on radeons which was pretty amazing. They even made it where many models were out of stock almost always. And pricing went up directly related to it. Eventually after ASICs it's funny the GPU's did go back down.