I'm veggie and I wondered the same thing and finally decided it wasn't worth it. I don't know about you but the majority of the food I eat are speed foods anyway and I don't want to miss out on my HE's!
I agree, unless you eat fish then you have nothing to gain from doing EE, and you would actually lose because you would have fewer HEs. The green plan is a great one for vegetarians as all the foods that go to make up a healthy vegetarian diet are free foods. As said, it is still useful however to base your meals around superfree foods rather than solely on free foods.