Assigning human levels of intelligence to "big bucks."
Deer aren't smart. I've seen enough of their tiny, smooth brains to know that. It's a goat. It's not a game of skill or a battle of wits, it's a game of numbers. One good buck is a 1 in 100 animal, so naturally you'll see fewer of them. He also is only grocery shopping for one, so he needs to move and feed less. He also is highly likely to have sustained an injury from a hunter, so he's very likely to avoid all risk when he encounters them because there's no fitness payoff involved with taking that chance. Young deer and does aren't "dumb." They just don't have a reason to be scared yet.
Passing a spike means you'll get to see him as a bigger buck next year and the year after. Unlikely since the young males of the species disperse to prevent interbreeding.
The idea on managing small properties. If you have a small piece of property, the best thing you can do is bait/plant a food plot and only hunt it opening weekend and peak rut. Everything else is a lot of work for a little payoff. Speaking from 10 years of experience on a 120 acre lease.