Yeah, don't fall into the trap of thinking you've got to get them all. They're NOT Pokemon. Treat yourself to one or two here or there. On new titles, I tend to get variants as they may help fund further purchases down the road if I sell them, but most of the only variants I get on existing titles are usually only Spider-Man and Batman.
Indy's CGC Gradings Master Thread - http://tinyurl.com/p45agbh
Want your Comic Graded or Pressed? - http://tinyurl.com/qywwqx5
Notify you of new Gradings? - http://tinyurl.com/no58cku