There really is no defense. It's just a money grab. When I was working there I dealt with it through compartmentalization and rationalization ("if I wasn't doing this someone else would, so I might as well earn that paycheck anyway"). Others there probably just didn't care.

The culture was very money-centric... everyone's compensation included a bonus component that was directly tied to how much revenue your products generated, and there would be big celebrations whenever new milestones were met.