I just sold my beloved S9 on Ebay (with good profit), as difficulty/hashrate is going up exponentially and BTCUSD exchange rate is not following as it was a month ago. Not saying that won't pick up again but it would need a huge kick in the bum to make up for all the miners coming online in Jan/Feb/March.
It's true what they say:
"When there's a gold rush, sell picks and shovels"...
this might be true but if you already have few miners, probably 6 or more, you can keep on adding up more miners from profit and to keep up with the difficulty.
but just buying 1 miner is not reasonable unless it is for fun and you have the $
That does not make sense.
ROI on 6 would not be different from ROI on one.
Unless I am missing something, this remains linear.
Agreed
you are missing breakage issues.
1 unit dead controller = 100% hash lost
6 units 1 dead controller = 16 ⅔ % hash lost
over time you will get dead units.. so having 3 or more allows swapping stuff. having only 1 does not.
I'm still not getting it I think, you are buying miners to run correct? Not for spares?
If you buy one now, all that matters is over what time frame those units will pay themselves back.
Whether you have other units running already and whether they can break has nothing to do with your this investment.
If you only have 1 miner and it breaks (and they do) - then you have no mining
If you have more than 1 and 1 breaks, you are still mining