I think it all has to do with power supply and cooling. If you can keep the miners in these and cool them easily they will maintain performance and profit.
If you try and add all the additional miners to the current setup you'll likely run into power issues and of course heat.
I ran a 12 card miner back in 2017/18 and cooling was the hardest part. The winter was great but once the summer hit your profit declines greatly without adequate cooling.
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