The problem is that we're all fighting over the same piece of pie. The more miners, the smaller the share. And before you shout "You just want it all for yourself!" and pull out the pitchforks, let me explain why it's too late, and why I'll shortly be stopping.
Rewind back to late May 2017 when the price shot up to $200. I assume a larger contributing force behind this were investors in Japan and elsewhere in Asia realizing that bitcoin was technically less capable than it's newer cousin, Ethereum. Several Asian exchanges started supporting it. Japan introduced a law legitimizing crypto-currencies and the rest was greed feeding greed.
Of course, I joined the bandwagon. I got in around here and shortly after the price shot up to $400. At the peak, my little 3 card setup was making me almost $20 USD a day. It's around this point that I imagine everyone doing this pats themselves on the back, tells themselves how clever they are and does an entirely unrealistic projection of how much money they are going to make.
Since then, the value has dropped back to ~$220 USD but the miners haven't stopped. They've been piling on like crazy. News of GPU shortages have only piqued interest and fueled the fire further. What these punters are forgetting to factor in is not just the price correction, but the difficulty increase. I thought I was clever. I thought I had factored it in but my projections were off. It turns out the world is far sillier and greedier than I expected.
To simply that even further: Every hour, roughly 1200 ETH at $225 each ($270kUSD), is up for grabs for miners.
It's easy to see why a gold rush was inevitable. But....
See that little red box on the difficulty evolution. Thats a bump of over 100 trillion in difficulty. At 33MH/s hashing rate (a single GTX1070 graphics card), that's equivalent to 30 million cards jumping on the mining bandwagon... overnight! Yes, there is some statistical error in there, but in any case it's a big increase!
Current returns are only a few dollars a day and electricity needs to be factored into that. Paying back your $500 graphics cards is going to take you an eternity if current trends continue.
I have seen photos of shops that churn out hundreds of rigs with thousands of cards at inflated prices. These are making the news and gullible first timers are jumping in without understanding the ecosystem. The clever money at the moment is in selling the shovel to the gold miner I assume...
I imagine there are a lot of people out there that have invested in this with cards on back-order so there is a delay in adding capacity to the network but already we're dangerously cost to returns dipping below the cost of electricity.
For me, I was going to burn the electricity on heating anyway so I'll continue through the winter and then sell it all off. It was an interesting flash in the pan, but still just a flash.