SVN wouldn't work well with WTF files. What I was thinking of is something that just monitors the dirs for files that change and then copies them over as they're changed, that way if today the right machine ran the auctioneer scan and tomorrow the left one does it's both saved together as long as it's the same account.

Like I said SyncToy almost does it but has some weird file locking issue that I haven't figured out yet.