That was an interesting study in the video. What I gathered from it was that supplemental feeding would indeed make a difference but it sounds like you really need a decent size piece of land and a lot of disposable income. The real gains from supplemental feeding in the study weren't seen until the second generation. That means that you need to feed for a number of years before you really start seeing a difference. It didn't really look like to me that going out for one or two summers and feeding would really impact things enough to justify the cost.