I don't mind telling where I have made my finds as long as they don't keep coming back time after time and cleaning it out. We had a woman in our club that wanted to know almost to the inch where we found something. When we asked her where she found something, she would say Wichita.
I think that would be my fear, too. I completely understand why people might be reluctant to give away spots, especially if there has been time and effort researching them. But on the flip side, it sort of gives socializing with other MDers an odd vibe, almost a level of mistrust which pretty much sucks.