true...but it won't affect me at all whether I spend 100 watts a day or 270 watts a day. At the end of the month it won't be very significant. Of course, for those who invest heavily in this, I believe they need to do a lot of calculations to know if it will be worth it or not

When you crunch 24/7 using 3060, that's a way more than 270 Watts per day.
Just the 3060 alone draws about 150-200 Watts, that's not including CPU, RAM, Mobo, Monitor, etc. If you use 3060 for 24 hours (a day), that's like 4000 Watts*h per day without including other components. 15 times more than "270 Watts per day".
If you don't pay for your electricity or have a flat fee, that's different.