3 ms·The easiest way would be to require a small payment to submit a "bid". Non-serious sellers won't pay.by dpatru 17y agoThe easiest way would be to require a small payment to submit a "bid". Non-serious sellers won't pay.lsb 17y agoAnd, further, show more prominently the sellers that have the best conversion rates, which you both could monitor via an intuitive analytics package.yeeyay 17y agoHmm. how about making the conversation between the vendor and the ad poster public?