Sorry Joe I tend to have little tolerance when it comes to scammers, so I get great joy watching a scammer get him or herself Scammed or ripped off, there is too much of this in the world as I have found out, but I suspect your right it takes a bigger crook to catch a crook, but more so it takes great expense to stop the scammers or whatever the junket word of the month is to stop them doing it again. Anyway E bay is easy to rip folk of on...and they do nothing about it.
Personally I dont buy from ebay any more, if I see an Item I like I contact the seller and deal direct or not at all.
But all that crap said I tend to agree with you regarding the vigilante, its to easy to get it wrong.
But there is no one out there policing it. thats why folk take matters into there own hands.
Anyhow "More Love Less Hate"