BFA Banana Plugs

I'm curios, what is wrong with bare wire. Up to a couple of years ago I was running Infinity Kappa 8's with electrical cord until joining this site. I had some audio quest wire left over from a surround system upstairs. I exchanged the electrical cord with it and noticed a slight change. I have been a music lover for 50 years so I don't want any bashing, my love for music no matter how it sounds should not matter. I looked in my Infinity manual and it actually said to use electrical cord. Last year I spent $20,000.00 upgrading and still using the audio quest cables with bare end connections. So. are banana plugs or spades worth anything if you don't plan on disconnecting them for years. I'm open for any positive comments. My new system which I don't need anymore negative comments is what I consider the best for me. I have two people in my area invite me over to hear their  1,000.00 to $200,000.00 systems. Both times I had to say how great they are but I like mine better. Invited them over to hear  not to make them feel bad but just to hear what I have. I was told to bring my own music with me so I brought a few CD's what I feel is best on my system, also brought one of my 3 SPL meters just to compare. I like 80 decibels or a little less for serious listening but with listening under the influence then 90 gets in the range. I pushed both of these systems to that point and not impressed.