What a great question.
And I know I don't have the answer but here are some thoughts. Sorry in advance for the length.
If I were to attribute to bucks the thoughts and reasoning powers similar to humans with regard to sex, then this is what I would think. The area where you hunt may have be close to a 1:1 ratio, but it isn't big enough to even be considered a bucks home range, consequently those bucks find better breeding grounds elsewhere. And the idea of a 1:1 ratio makes sense for an intense rut if the area is large enough that the resident deer herd isn't going to wander off and find more lucrative breeding grounds, i.e. a high fenced Texas ranch. I think it is one of those scenarios that when viewed from a behavioral perspective makes sense, but in the real world the truth doesn't quite hold up, if for no other reason than deer wander.
But if I'm going to believe deer, particularly bucks are ruled by their hormones and have no real reasoning power when it comes to sex urges, other than to breed, I'd have to believe that once a doe is in estrus the bucks are stuck there, even when she is with another buck. Simply because the attraction is so great and overrules all of their other thought processes, and since the buck can't reason there are better opportunities over the next hill he isn't going to take off for greener pastures so to speak and see what else is out there. The chemical/hormonal attraction is too great for them to go elsewhere.
Which is right, you'd have to ask a deer bioligist. Maybe a little of both come into play.
As for seeing the rut as it has been described in all the hunting magazines. All I can tell you is this;
I've read about big time rutting activity, but in my 9 years of deer hunting I've only witnessed serious chasing two times. Most of what I've seen has been bucks wandering around in a seeking mode, looking for something to do, nothing crazy like you may read about in magazines.
In all honesty, in our area I don't believe we could shoot enough does to really make all that much of a difference on breeding behavior. I'd like to think the couple I took out early this year helped move the bucks my brother and I shot, but in reality I know better. Shoot, I'm pretty sure the chasing phase hadn't even started by mid-November gun season, despite what all the magazines and experts would tell you.
Bottom line to me is; the idea of an explosive, intense rut isn't the reality for most of us no matter what the buck to doe ratio.
“There are two spiritual dangers in not owning a farm. One is the danger of supposing that breakfast comes from the grocery, and the other that heat comes from the furnace.”