I can tell you love a good debate as do I my friend but I'll be the first to admit I'd have an uphill battle trying to prove magical stones exist, honestly I just don't know.
I believed that I had enough empirical evidence to write this post but in all actuality the phenomenon I've experienced with people feeling good at the property may not have anything to do with the stone at all but rather with me.
But I couldn't prove that either :o)
I do indeed :)
I don't know is always acceptable, we can't know everything. I think your second hypothesis is much more likely ;)
You could actually try some experiments by removing yourself and/or the stone to check how people would feel about the place :P But yeah, that would be a bit too much ;)