This is a bizarre, yet compelling thread.
Most of the guns mentioned here are such obvious pieces of junk.

What possible motivation could any sensible person have to want to buy them to begin with?

It’s one thing to do a little research (or just plain logical thinking!) and make a disappointing purchase.

Is it just a morbid curiosity to discover just how bad “bad” can be?

A friend of mine owns a pawn shop. He is one of the most insightful people I’ve known regarding the subject of human nature and impulsive/compulsive behavior, particularly as it pertains to throwing away money.
He makes a lot of profit selling many of the guns specifically mentioned here. Over and over again, it’s what a lot of people want to buy (and ultimately want to sell!)
And, quite often it’s the same individuals making the same dumb mistakes!

The resale values rarely exceed 10-20% of the purchase price.