I don't think that's quite the point.
Like most other people, I don't like tree-snatchers, partly because of all the work I've put into mine for 'joy riders' to come along and half-inch the lot without a please or thank you.
And I agree with Guy (who's obviously much more altruistic than me!) that, once you put your tree 'out there' you've given it up to all and sundry.
What I don't care for is the mindless way people adopt parts of my tree without questioning. In my very early days of research, I gave some
theoretical info on a particular stubborn brickwall to someone but emphasised that it was just my theory which I was looking into. Some time later, I accessed those particular parish registers and found a childhood death for the chap in my theory so had to start looking elsewhere. The point being that I still find my original theory in lots of trees, the owners obviously having annexed this poor lad who died in infancy and his earlier family - probably for all eternity!!
Not only is it dishonest, its totally counter productive. A serious researcher would not accept info withour looking into it him/herself. I just wonder how many 'serious' researchers there are out there, and how many are just playing at it?
Hence my reluctance, like Martin, to post my tree on Ancestry. However, I gave in and posted my tree for DNA purposes - and I still say it hasn't made a ha'pence of difference to the number of matches making first contact (god, I sound like ET!!). 'Scuse me whilst I just phone home!!
Jill