That's not really fair. I'm not sure what's "disposable" about about someone trading an older console that's collecting dust in their garage to a breeder that wants it and would just use the money from a cash sale to buy it instead. I normally don't accept trades but wouldn't mind if it was the same item I would be purchasing regardless of the deal (which granted has not happened to date).
I would agree with you though about animals being disposable when people list their family dog in trade for more morphs. I see these pop up every now and then and those "traders" immediately make my stay away from list.