but it would be interesting to know why it works in some areas.....and why (factually) it WOULDN'T work in others.
Some states, some counties within states, have a high number of deer per square mile. Some have much, much lower density. I've hunted in north Texas all my life and never thought it was bad hunting. On my first trip into the Hill Country though, I saw 10 times more road kill deer on that drive than I'd seen in 35 years of driving on north Texas roads, combined. There was at least one for every mile between Brady and Mason, south of Abilene. I could add up every deer I'd ever seen in my life before, and the total couldn't come close to adding up to the number I saw on that one ranch on that single weekend. It was incredible.
No way bowhunters could be able to harvest enough deer from that area to keep numbers in check. It's heavily gun hunted already and it's not happening.