That is not so true...
Take care on what you are saying, because they are not amateurs, they are good professionals in aviation operations. The big problem is that ACMI operation is unpredictable, depends only of Commercial Staff, the Ground and Flight Ops of EuroAtlantic take an enormous effort to put the planes on the ride!
Sometimes things go right, sometimes they dont, so those colleagues who stayed as relief for that long had really bad luck and timming (all the planes were based elsewhere, and flight ops couldnt fit those guys in any operation)