I understand your frustration.  I've been to busy to frequent the collectables section the last few months, but after suchmoon's post I went to have a look-see.  That is quite an annoying troll, and very likely a ban-evader. 

However, your use of negative reviews does give the appearance that you're weaponizing the trust system to get what you want.  People are bound to take that angrily, and some will retaliate.  I hope the ramifications are temporary and cooler heads prevail.