My son found a Trek Madone bike on ebay for $1000.00. I emailed the seller and immediately received a response saying that it was new unopened and would be shipped fm Europe. The seller had 850 feedback entries and was 99.5% positive. I 'live chatted' with Ebay because it was suspicious, but they just said send them an email and they would research it. What kind of scam could this be ?