That ' s why I said purpose advertised . If it was clear that he was the main tank of this raid group and he donated under that premise , then changing the premise invalidates the donation . Going by your example of donating to a charity and assuming they ' ll support you despite the charity stating nothing , you ' re right in it being foolish . But if you donate to a charity that purports to support all businesses and they don ' t support yours , you ' re in your right to claim unfair treatment . Similarly in my example , if the charity was open about all the money going to one of their paperpushers , pocketing all the money for that employee would be acceptable . If they claim to support , say , 3 rd world countries and then pocket the money , we ' d have an issue .