There are respectful and non-respectful hunters. I know the exact area you are talking about and yes, it's tough and hardly anyone goes there. I was introduced there by my buddy. I've always respected the area as my buddy's. I scout the area pre season and report to my buddy what I see. I also met another hunter there and I keep in touch with him. Another cool guy. So now, including you, I know of 4 that hunts there but thats not the problem. It is actually a good thing (explain later).
The problem are the non-respectful hunters. Which is what one might be inviting when one broadcasts a spot. The hunters who are abrasive, littering, guns displayed at the trailhead type. I can and have done what I just mentioned but not at your spot though. The issue with your spot like other areas in orange county is that you don't start at the national forest. It is actually a county park which has plenty of non-hunter activity which includes hiking and mountain biking. Most of those people are sierra clubbers which wants our type gone. So my fear is that these "problem hunters" just might cause attention which could shut down "our" entrance to the national forest.
It's not that I don't want more people there. Respectful hunters by the numbers are great. I wish there was more of us which could show the general public that we are not just "killers" looking for blood. I've introduced new and experienced hunters to my other spot. I pay it forward but I know most of these people and know their personality. They won't cast a bad light on our kind out in the hills.
I hope you understand my explanation. I don't know if it's the same as others but this is how I feel and reason for the secrecy. BTW, I have had the sheriff department team including a helicopter called out on us there one time. Long story, but bottom line is that the neighborhood does keep a good watch and report what is happening in those hills. I would be very sad when the day comes that our access has been denied and we can no longer enjoy our forest as hunters.
Also congrats at your spot, King! Kudos to that mountain biker who helped you also.