This has happened to some of our ads. In fact, we were working on the roof of a house after our last ice storm and three different families stopped by to check out the "great deal" ($650 rent for a 4 bedroom, 3 bath house I rent for $995). The funny thing is, all three sorta "knew" it had to be a scam so at least they had the common sense to check it out. I'm wondering how many just sent the deposit in to the person claiming to be the "owner".
Here in the south you can sometimes (literally) get away with murder if you claim to be some type of reverend/ minister/man/woman of god/whatever which is exactly what this scammer was claiming.
I report the ads to craigslist, they are pulled, only to show up again a few days later. And the newest ones have no pictures included, just a description.
I hate to say it but I can't monitor craiglist/zillow/hotpads each and every day (and one of the ads that still shows up involves a house I've had rented since September of 2013). I'm coming to the conclusion that while there's a lot of naive and desperate renters out there, there are also a whole bunch of folks looking for "that deal" (who isn't??) and I suppose if they are dumb enough to fork over the money without viewing a place; well, maybe that's just a hard lesson they'll have to learn.