I had a guy try a bid on an item last week who I had blocked. He asked why he was banned from bidding?
I reminded him two months earlier he was personally going to collect the item and pay £400 cash on a Saturday morning. I got up early, went to the warehouse, opened up, packed the order, brought it home, called hi and no answer. Tried many times to no avail.
I was doing him a favour and I was going away that day so the cash was handy
So he was blocked.
His reply, the classic 'oh I had personal problems'.