I hosted several Do's in the 90's, but no more. The first few Do's were populated by some great people who were not only relatively like-minded, but also generous themselves. Then as Flyertalk became more popular the inevitable happened. People were who were not as much like-minded and not so generous started attending Do's.

So hosting Do's became less fun. Nobody wants to go through all that effort to find that some of their guests can't be happy with your arrangements. Then, in some cases, even attended Do's became less than pleasant. It's nothing unique to Flyertalk. It's just human nature. The natural evolution is that groups of people who meet on Flyertalk and like each other now have private Do's. Purists might not like it, but again, its just human nature.