the reason you drink green smoothies is for the health benefits. greens should make up 40% minimum of your daily intake. they have so many important nutrients for our bodies to repair themselves. that's why people with cancer, ms, fibermyalga (sp?) etc start drinking these... to heal themselves.
you add different greens to the smoothies and by adding the fruit you don't taste the sometimes strong flavour of the greens. although once you've been drinking them for awhile (like me) you get to like the flavour.
it's all about health. it's all about nutrition.
and... it's all about taste!