When you are enrolled in campaign, it means campaign manager trusted you enough to find place for you. "I don't give a damn" isn't right to my mind.
It all boils down to the money, people are looking for extra bucks so they will look for other campaign to join, but I am pretty sure the manager looked into this matter and its possible that they will not be rehire again.
BTW, read carefully the last post by the manager, the open slot is for sr member, if you have are a member with higher rank, it's wise if you'll indicate that you are willing to accept a sr spot, just to know you are aware of the current opening.