It's also interesting to note that of the people you mentioned, only Rickenbacker survived the war. (Unless you were referring to Lothar von Richtofen!) Maybe Eddie's race car experience put him in the right frame of mind to be a survivor or maybe his ear infection took him out long enough to where his luck didn't have time to run out. Even in the cases where you had individuals of great skill, such as Ball or Voss or Boelcke, the odds eventually caught up to them. Richtofen, who, even by his own admission, was not a spectacular pilot, seemed to survive as long as he did mostly due to his iron-fisted determintaion to follow the hard lessons learned in the early days of Jasta 2. When he did fail to follow them, target fixing on a hapless Camel to become #81, what happened? Shot down. 
Even for the aces that survived the war, many didn't live to see the next one. It seems that their experiences changed them and they had a hard time adapting to life after the war, most likely due to what is now know as post traumatic stress.  
  
Wow, thanks for bumming me out guys. 
  
  
  
RR