How to modify a for sale listing

I am selling a component on Audiogon. I have had an offer, so the ad cannot be edited. But I want to lower the asking price to stimulate interest, and it appears I am blocked from doing so. Is there any way to do this? If not, the admin policy strikes me as shortsighted if not infuriating. They make you pay up front for the ad so it’s of no consequence to them if the item doesn’t sell. If there’s a way to reduce the asking price, I’d like to know.