How could there be? The MARGIN stays the same issue regardless of how much VOLUME you have.
You're focusing on just the cards, not the infrastructure, power costs, or labor... If you're paying $.25 per kwh and I'm paying $.08 kwh... things become unprofitable for you, way before they do for me.
Also scale as well... if you have 1 machine making $1 USD a day profit... it might not be worth the headache.... but if I have 200 machines making $1 a day profit it might very well be worth the headache.
No you actually just skipped the part where I said margin. Margin being value made or lost after cost => obviously factoring in the price for the kwh. What else is there other than material degradation for cost?
As for who is spitting in the soup: the exploitative bungholios who build whole GPU farms and stuff their housrs full of PCs dedicated to mining are. If I in order to refinance my idle GPU cycles want to mine BTC with my 180 mhash and they run around 2ghash for a single person, who is the one greedily and grossly out of scale?
From a "just" / "fair" standpoint, it's like them taking up 10 seats in the cinema and everyone else being confined to the bad seats..there is no entitlement to getting rich off of BTC for anyone, hobby or "pro".
As for whether to do it or not - as long as I come out even +0 profit, but am fully paid for my power useage, I'll do it. Simply because this is my work PC which is used for actual real world stuff and it will mean "free" work hours for one half of the day, "free" watching of movies, listening to music, etc for the rest.
The mining is just the icing on the cake to make it a "free" PC to run.
Staking my livelyhood on something like this would be fairly stupid in my eyes(people are "investing" 10s of thousands of real world currency, going into debt to build "rigs" etc..good god).
Anyway.
On topic: I would actually like to flip the argument.
Due to the "pros" staking their real food/rent/etc income on this fun game, THEY are the ones who will be in debt, evicted and unable to pay for food first when the margin drops to 10-50 cent a day profit per machine total, instead of anyone who only does this on the side for a hobby.
As they need to rely on the income.
And ironically they are the ones causing the huge difficulty bumps in the first place(because of taking up 10+ spaces instead of 1 etc, buying tons of 6990s and so on).
So they may regulate themselves out once the "run" gets frothy / peaky, then the people that still think it makes sense after that trickle back in and we may get an equilibrium around the point where a balance between some money made to live on and not enough made happens.
Theoretically.
Then people find out about margin trading and blow up the whole pricing mechanism thanks to leverage fun and games.
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I also approve of Horkabork.