It is interesting that the listings are gone so fast after a report.
If we put ourselves in eBay's position, we'd have to come up with an automatic rule that deletes bad listings by our scammer. If we deleted anything with a link to an external email, we'd probably delete too many good ones. The more good listings eBay kills, the more "pain" it feels on its bottom line.
But -- if there is a single report of fraud AND an external email link (and possibly the Airstream name) -- then they can be pretty sure it's a scam and delete it. The pain of eBay's reputation loss exceeds the loss of good listings.
If that's true, they are relying on users to police the system. We should be compensated for this, shouldn't we???