Really satisfied???

I was wondering how many audiophiles are really satisfied with their systems to a point where they feel like there is no need to upgrade anymore. I say to myself sometimes there is no way anything else i can buy or replace can make my system sound any better. But then the next day i am looking and reading about what cd player or separates may sound better than my Krell KPS 20i.  My system consists of Krell FPB 600 , Mark Levinson 38s, Krell KPS 20i , Krell B&W Bass Alignment filters BAFs Balanced (2) , B&W Matrix 800s , Straightwire Crescendo speaker cable and interconnects. Am i really satisfied?? Hmmmmmm