Tony, a small landowner can improve the herd. Now what your definition of improvement is, that's another story. If I help the deer get through a hard winter, help some deer survive that might not make it, help the deer fawns avoid coyote predation, that's what I consider improving the herd. Habitat improvement is the biggest thing that I can do to help.
Does it benefit me as a hunter? Of course. Am I doing it to increase the bucks horn zize? No. I am doing it to make it easier for me to put a couple deer in the freezer so don't have to buy beef all year long.