Let's look at the 7 to 5 cents difference.
3000W running 24 hours is 72kwh, in one instance it is $5.04 in the other is $3.60.
Earnings right now are at 0.06 per th/s so that's $6.60 per miner.
The first miner makes $1.56 second one makes $3, 25% drop in price, and the first miner mines at a loss the second one still makes $1.4.
Same for a difficulty increase with linear price.
Also note, it's not that I'm telling you my crystal ball is 101% sure you're going to lose money, what I want to point out is the risks of doing so and if the KYC thing and the DCA income are enough of an offset for the pain in the ass those miners might turn out to be. Canada you say, so no much of a heat issue but noise and maintenance will still be around.
It sure is a scary time for miners these days. I am surprised hardware is not cheaper.
It's cold where I live so that is an advantage for once!
I just setup an AC Infinity Airlift T16 fan for airflow in my garage. That keeps the S19j Pro fans running at 3500rpm so not much noise anymore.