2000 dollars,the last scam I heard of netted 140,000 dollars in 24 hours
I almost fell for some scammer-- he put up some NIB laptop up for sale on ebay which went for about $1000 and then sent second chance offers to everyone since I was the 10th highest bidder and got a second chance offer. I was a bit suspicious so I bought the second chance offer but told him that I would pick up the item. It looked like he hijacked someone else's account with 100% feedback.
I don't think the feedback means much on ebay the way it is today (except for the discount on ebay fees). I get treated nicely by sellers even with feedback < 10 and harshly by some with high feedback so it's not that big of deal. And some people are around for many years but don't have a big feedback number.