How many of us are truly satisfied with their systems?

Count me in twice.  Both my main system and my secondary system have been optimized so far as I am concerned and will remain so for the foreseeable future.

Elizabeth said it best. 
  If you’re an audiophile, you tweak, because you’re an audiophile.
If you didn’t tweak, you wouldn’t be an audiophile.

 It’s all in your head.

It is not easy to exhibit financial restraint when it comes to our hobbies or passions (in our case, music & audio). However, retirement or impending retirement will certainly force one to do so. If you are in that boat, I hope that after 40 - 50 years of trial and error, you've managed to find an audio system that you either love or can at least live with.

I am satisfied, but it took a quarter century to get there and I have two systems to give me everything I want.  But it is possible!

I guess I'm one of the uninformed happy ones. I haven't purchased anything of substance in over 6 years, my speakers haven't been relocated, nor has my chair been relocated. I fiddle with minor stuff on rainy days but for the most part all of my audiophile energy has been redirected to the recorded music  aspect of this hobby. My present systems sounds good enough for me as is, but I can always appreciate new music.