I think it depends. I am sympathetic to offline jumpseaters, and in over 20 years, I have never bumped anyone. If my jumpseat cancelled or I was bumped, I have always found another way. However....

We are taking far more offline jumpseaters than we used to. Should we have to buy a ticket in the case that we are bumped or our jumpseat cancelled, when an offline jumpseater is going home, also? How many pilots from other airlines would decline to bump you if they had to buy a ticket, a hotel room and get home the next day? What about when you're going to work, your airplane breaks, the next airplane is full of offline jumpseaters. Should we really sacrifice a week (or more) of pay, in order to not bump an offline jumpseater?

I definitely think people should try to find a way other than bumping anyone, however, when you're buying tickets, hotels and losing trips....and the other airlines will bump you in a minute if someone else walks up, maybe not.