First, you cannot sell on the gym as you can on here. You have free range and honestly more exposure for collector cards, especially for the cards you have posted. The gym is perfect for playing cards, but weak on collecting. This thread has been up for over 2 months and the back and fourth needs to just be fourth (forwards).
Also the whole I have cards but they aren’t mine and the back and fourth on prices does not fly on other threads. From reading the thread myself I could not tell if you had the cards, if someone else does, and because of the back and fourth there is a sense of confusion. To do good business it needs to be plain and simple, we just want things to go smoothly for both the buyer and seller!