I have been considering doing this simply out of curiosity about just that, but I have no particular interest in contacting distant relatives. I did a lot of the genealogy back in the '60s and early '70s, and had solidly documented a few thousand individuals. ALL of the results of that were lost in a fire about 20 years ago (along with all my other stuff -- including family photos, decades of notes and files, and original documents dating back to the 1590s

--sort of knocked the stuffing out of me emotionally, as you can well guess). All I have left is my memory of what I found and where I found it (which, so far, has been pretty good, I
think). I don't have the time, the energy, the money, or, frankly, the spirit to do it all over again.
On another note, I have also considered it for my son, who is adopted -- if he should ever express an interest (he is mildly curious). His was an international adoption, by the way, and it's interesting to note that in some countries adoption records are open. We already have the names of his birth parents, and maternal grandparents (they're in the adoption records) -- a good starting place if he ever wants to trace it (my ex-wife, his mother finds that a frightening thought, for some reason). [BTW: He also has to keep away from Brazil until he's over 35, or he might find himself conscripted -- they say it's a real danger, we were warned even by people at the Brazilian Consulate.]