Where in your message does it make any kind of common sense?
Mariah was not talking about someone using PW to rebuild themselves back to high health, or take the time to mine (After all, thats about all you can do while pw).
She was talking about someone deliberatly abusing the fact that they cannot be slain to enter an enemy cities storeroom. I was warned about using certain skills I have to kill PW's, but in this case I think an exception would be made.
Unfortunatly there are only two guilds I know of that can kill PW's, so they have a distinct advantage when they want to take advantage and break the rules.
I think any sane person can see the distinct differences between the situation in Mariahs and your post Camaris.
Written by my hand on the 4th of Mournsend, in the year 1024.