Given the risk and cost of just showing up for work, and the clear need to staff up, that average wage seems low to me.
What costs?
Hard to pin down in this case. In addition to the usual costs, being drained and short on personal time is quite expensive mentally as well as physically. I am sure a fair number of these people are basically working and sleeping, or recovering during the limited downtime left to them. Very expensive in terms of basic life opportunity costs.
Risks are obvious, and include getting sick as well as just run down, lack of sleep, other impacts.
I hear talk about hazard pay. Totally warranted and indicated. That has to be driving the higher numbers choosing travelling positions.
Covid is proving difficult and appears to be with us for the long haul. My sense is this pandemic may be generational in terms of it's impact and time for humanity to come to real terms with it.
Very young people today will enter the world with the best medicine and general resilience one gets from youth and the very old will be coping and cautious as they age out. We won't really return to that state of things we all remember being facts of life not so long ago.
And we need these people to be happier, healthier and we need more of them and will for a considerable time.