I could say that a neutral trust is a must and even a negative trust is justified in this case.
No offence marc coins but no one forced you to be a part of this auction and if you are really busy in your real life then a simple message to the OP would avoid all this mess (since you had connected here several times a message will take from you less than 1 minute...).
I recommend from both to end the purchase, mark the topic as solved then close it.