The problem of course is if people started thinking in relative terms then there would be little or no incentive for the wealthy to give anything at all. In this version of a just world, this $180k gift would be just as ignored as the $7.50 gift. The fact that this person gave non-anonymously tells me that it was about PR as much as anything else.
BTW, truly blessed are the ones who give anonymously. That, to me, is the ultimate in giving, because you receive nothing, not even notoriety, in return.