I like offers myself sometimes as I can make comment on why my offer is what it is to the seller that may not know about marbles.
Recently, a seller was asking $250 for marbles she got from the seller's dad when he passed. Clearly they were not worth $250 so I explained to the seller about the marbles that were really worth $50 and I was not disrespecting her or her dad, but trying to let her know about the marble's worth.
She email me back with a very pleasant response and thanked me. I won the offer at $50 and received 250 marbles!!!!!
Rich