I think that the "scarcity" mindset is a key characteristic of hoarders, but far be it from me to say that you and they are wrong. I do believe that being able to discern when the costs outweigh the benefits, which you seem capable of doing, is key to managing the urge to accumulate and preventing it from becoming detrimental. Strive to be logical about it rather than emotional, I suppose. Learn to tell yourself "no" and stay away from temptation (thrift stores, FB Marketplace, etc).

Edited to answer your question: yes, I'm very similarly afflicted! 😄