Even $1.00 per ad is dirt cheap. Run until it sells and instead of making $400, you make $399.
Just don’t see how anyone loses with that?
To be fair, some of these ads pop up every month for 2 years straight. Is it a dollar per ad or a dollar per item? Are there timelines? This could get complicated. It would be nice if they sold something like a yearly subscription where people that want to support the site can.