A random mature buck killed every few years can be labeled as luck, those killing them year in and year out, especially so on small private and even public lands, takes a whole other level of skill vs the random mature buck every few years by the guy who hunts a lot. Anybody that thinks you can kill mature bucks every year for many years in a row, simply relying on luck, will have a very rude wake up call when trying it for themselves! I know a lot of people who hunt, have many many friends who hunt, and its always the same few guys who are killing the older bucks, regardless of their situation as it pertains to the properties they hunt. This seems to be even more prevalent here in East TN where our deer herd is smaller than anywhere else in the state, hence making seeing/killing any deer harder, especially the old bucks, simply because we just dont have as many as other areas where the deer herd is larger. Luck imo is the very random acts that happen, far from the consistent episodes that some hunters produce year in and year out! All that said, it never hurts to have some things go your way, just dont rely on this for your success unless you want to be calling somebody else a lucky dog year after year.
To explain a lil farther, lets take 10 hunters and give them all access to the same 5 properties, every year for 10 years in a row, all 5 new to them every year , no previous knowledge of the land. At the end of the 10 years you will have a few that simply outproduced the others by a good margin when it comes to killing mature bucks. This is definitely not luck, especially with all the factors being exactly the same for everybody.