If you want to open the flood gates and allow anyone to purchase as many gpus as they want then you are still handing over control to the miners with the most power unless you have a literal unlimited supply of product. Limiting sales allows for better control of the market giving more people the ability to buy.
The other end of that stick is, why would the big power players continue to mine the coin if they can't exercise the purpose of the coin, which is direct exchange for equipment? They could sell it for BTC who folks who want to buy, but that's still a dead end because those folks are also limited. It's a self-denying cycle at that point, and the hashrate will drop/fluctuate wildly.
Yes, it does call for a hella supply. This is why I warned the owner to ensure he can flow GPU's by the truckload first. I suggested ways for him to increase volume.. and I was ignored.
He jumped in feet first without making sure he could swim--on every aspect of this venture. The best thing he brought to the table was simply the idea, to be honest.
The math is not a simple linear curve for electricity usage, that would carry the assumption that diff never changes and that there is no variance in price. You cannot produce the same number of coins consistently with the same amount of power. Over time that number grows and shrinks based on a number of factors. 1 GPU at x watts at y diff will produce z coins with n price. It is anything but linear. For me personally my overhead is so tiny it's basically non existent it costs me $4.75 a month to run my rig.
Just to clarify you are correct about coin creation on the network as a whole being linear, the network will always produce 1440 blocks a day of 20,000 coins per block until the halvening; But singularly it is not linear by any means.
This is where the law of averages kicks in. Yes, diff will vary. If you're on a coin which is in fact profitable (you make more than it costs to mine), typically those coins increase in value over time with diff, or shortly after positive swings. In 8 months being in the crypto world, I've yet to find a profitable coin which has failed this equation. I'm not saying that for every cycle of hash you produce, you make the exact same coin, and cashout the exact same earning. I'm saying that within a high level of confidence if you're mining a profitable coin, your earnings will be pretty much linear to your hashrate.
This is why a lot of senior members only mine the founding coins, or certain altcoins, and don't pool hop. It's also why some people will only mine if it's profitable.
For this particular coin, the people who don't see it as paying the electric are the ones who would've just mined it to sell anyhow--and the folks who are here for the GPUs are concerned because the owner hasn't truly provided any proof of capability he can provide flow.
I would love a $5 electric bill, I won't lie. Haha. But my electric is paid for in mining, so it's not a bad trade.