I have made some purchasing mistakes in my time. I remember an "audiophile" CD player which I bought for 40% off, the Muse Signature 9, somewhere around $2000 back in the 90s. It was awful, cut off beginning and ending transients. I guess I bought it because my analog would always beat CDs in the 80's and 90's. Worse than my Sonys and Kyoceras.
I bought speakers in the 80's and 90's that didn't suit my electronics but I sold them for minor losses. Most recently I purchased some SR products which were more playthings than sound enhancements (I love SR duplex outlets, fuses and HFTs).
Got 80% of my purchase price back.
So, we all make mistakes along the way to building a great audio system. My equipment is mostly 13 to 30 years old with only cables and tweaks which are recent purchases and my new DAC, the COS Engineering D2 as of yesterday.
Yes, that expensive CD player purchase bugs me even today.