This has been pointed out many times over the years. The eBay threads roll on, however. Meanwhile, I'm sure that all these offending eBay sellers are glued to r.m.c.r., awaiting their enlightenment.
You can set kill filters in various ways to avoid the eBay threads. After long thought, and with no small amount of regret, I finally killfiled the threads' author. It's worked out great: I now avoid the incessant troll- (or 'troll'

feeding (baiting) as well!