So you admit his accusation was correct? No matter what you were changing the prices up and down for, you still were when he had the GUI open, thus potentially trying to scam him. If "no scamming" is a rule (or if "common sense" is a rule), then Bushido had every right to ban you.
No, he was going a bit back and forth between my shop and his.
He happened to be close a few times when I changed the price.
I
do change the sign before I change the price, so if that did happen it would really be his fault.