I think I need it because I don't eat a lot of protein-rich foods. I'm allergic to nuts, so that rules those out as a source. I try to avoid over-processed mock meats and such so I don't get protein in that regard either. I don't eat a lot of legumes, either. And I'm planning on going to the gym and 'building muscle'
It may not even be a necessary venture but I figure it can't do any harm?