I've been an amateur genealogist for almost 40 years and I'm still continually amazed by the openhandedness I encounter among my fellow researchers - genealogists have to be the most generous bunch of people in the world.
I try to pass on information from records I come across that establish relationships, maiden names, AKAs and so on. This seems like the least we can do for our ancestors.
I feel especially compelled to create pages or fill in the biographical blanks for fallen soldiers, whether or not I'm directly related and regardless of the conflict or the cause, especially for those who seem to have been forgotten because they had no spouse or children or surviving parents to memorialize them. It just seems wrong for someone's ultimate sacrifice to go unremarked.