Resources? My PC has been on 24 hours a day every year long before I knew about this puzzle. So for me the costs are what they already were

You should not forget that your PC's power consumption heavily depends on the task it's doing. It can vary a lot from a few Watts to several hundreds.
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
especially for those who rent