I Know. I'm pushed to the limit myself with my 'pet' seeding projects and keeping up with what I currently have growing and everything that you know goes along with that. With me its 'time'. It's often said: "where does it stop? Well, it stops when a person 'just can't handle' anymore-- while still keeping a hobby enjoyable--and with me its the standpoint of time--not the land space.
I'm still 'greedy' on such a study, however. If I have time this Fall, I just may start one. In the meantime tho, before and after pictures and pictures of untreated over time-- from this broad forum base is still interesting and valuable.