Found this whole thread very interesting indeed, and I can see both sides of what you are all saying.
I joined GR a couple of years ago, and its rewards have been quite beneficial to me. I have traced my grandfathers brothers through it which I think would have been impossible otherwise. Their families found me, and I found their families ... fair deal.
However, Bills original point about others gleaming "your" information is pertinent. It has to be said though, that nobody has access to you tree unless you explicitly give them permission to view your tree. If you were possessive of your information, then you can deny all who approaches you. But, the beauty of this brother/sisterhood of the genealogy game is the sharing of information, but, alas, only amongst like minded individuals like ourselves.
The real issue is who actually "owns" that information once you have put it up on GR. More disturbingly, as Bill points out that they have been bought over by a COMMERCIAL tv company, what can they do with "our" information. Did any of us actually read the terms of use when we subscribed at the start. Have we lost our intellectual rights regarding our hard earned information? More concerning is that many people have put in their trees living persons ... date of birth, marital status, age and a location. What would happen if that got into the wrong hands?
Although we are concerned what we have done in the past, I think that there should be concerns over what possibly might happen in the future.
Neil