1) Since I treat it as a meal I'd like to have at least some vegetables with it
2) I suck at eating fruit and vegetables. Other than this I have some dried apricots with breakfast, about 1/3 of an onion in my lunch (chili variation), banana after lunch, some spinach with supper. So adding this to shake almost doubles the amount of vegetables I get during the day.
So essentially, I see it more as an easy to make, easy to transport post-workout meal that's bulk oriented