Optimize or buy new gear..?

To me this is very much an it depends question. What gear do you have and what improvements in sound are you looking for. If you want a sea change cables and ancillaries may not get you there. But if your mostly happy they can get you that final step closer.

Cables is the last thing you must be interested in...

If not throw money in a useless well...

I say that not because i am not able to perceive differences in cables... I can...

But the difference compared to all other factors implied (mechanical,electrical,acoustical) is small ...

Then cables is a part of the consumers programming...

Take note as i said i am not an objectivist mocking audiophile buying cables, i know cables matter...But i am neither a subjectivist mind focusing on cables because he never study and experiment with accoustics or anything else ...

I had a similar experience with speaker cables.  I had gone through several sets of cables, none grossly expensive but all in the “several hundred dollars” range.  All sounded good, one or two modestly better than the others.  Then, several months ago, based on reviews, user comments, recommendations, and in light of the trial period, I ordered a set of Silversmith Fidelium speaker cables.  They were an instant “WOW!”  Better tonal qualities, better instrument location, much improved soundstage, and improvement in the bass reproduction, which was my major point of dissatisfaction with my speakers.  Even my wife, who enjoys good music but is not “in to” how it is achieved, remarked almost immediately on the improvements.  I was a bit of a skeptic on the impact of cabling … but not any more, for I have seen (heard!) how cables CAN make a difference.

ho·me·o·sta·sis:  Aim to keep your components complimentary and of balanced quality.  Balance = Optimization  Exorcise your system and cast off the weakest links!