alt Hacker NewsOP means to say he has many jobs in the merge queue that the runners are always busy 24/7.
This is not uncommon in some orgs - less number of concurrent runners, slow builds, loads of jobs because of automation or how hooks for the runners are setup.
In the context of discussion that doesn't matter, OP's point distills to that they use minimum of 720 hours / month of orchestration time or some multiple of that on self hosted runners running 24x7.
Github will now charge $84 extra per month for single self-hosted runner running 24x7 - i.e. that is the cost for 43,200 build minutes for only their orchestration alone.
In a more typical setup that is equivalent to say 5 self-hosted running running ~4.5 hours a day(i.e 144/hours/runner/month)
Replies
OP replied and clarified that that's not the case.
If you have a lot of not very time sensitive jobs, e.g. large merge trains, it was reasonable to have a not very fast runner run close to full utilization. Now that you'd pay by the run-minute, it'll be cheaper to move to a faster runner and run it at 10%.