I bought things I shouldn't have many times, but I also accept that this is part of my personality, I get excited by the possibilities of the VI or Synth or plugin. In recent times that has reduced and this BF I had a list that I reasonably kept to (still had to gulp a bit at the cost).
My biggest challenge is time, or the lack of it to learn everything, including all the sample libraries, plugins and synths.
I don't do regrets, I try and learn from things, so it happens less often, but I also try to understand why I bought what I did.
In the end music, sample libraries, synths, etc got me through 2 years of lock down whilst doing a pretty boring job. For getting me through that I am grateful, even if it did end up costing a small fortune.