> If you took time off during an on-call shift you would be trading it with a team member, so you would never lose that extra wage.

I think this is true in _most cases_, but is not a given. I myself have encountered scenarios where it isn’t true: switching with someone much later in the rotation, only to then end up having to switch again for instance. You could envision a nefarious teammate weaseling out of their fair share with sneaky switches like this, too, though paying for it would maybe incentivize them not to!

Of course it wouldn’t be hard to figure out a rough average on-call amount to pay during PTO