Is this scam mainly on forums like these since the transaction is based on good faith or does this work also on ebay? I would assume ebay is safe since you deal with paypal.
It can happen on ebay as well, just that they don't last very long, since the bad feedback soon adds up and it's all over.
I got taken on a Bilbo statue last year. I had a couple of warning bells going off, but it was a great price at the time, so I went ahead. First warning was that payment wasn't via Paypal (I know now that's because they have been banned by Paypal), instead I had to use Google Checkout (their banned from them as well now).
However I did use a Credit Card (that became very important in the end). Because I was an overseas order, I had the extra issue of postage lag, which made it all stretch out over time. What they did, was send the package (no idea what was in it) but made sure to stuff something up, so it was never delivered to me and over time was return to them. The item inside was then broken (I bet it was broken from the very start) and they claim on postage insurance. During the whole time, they are emailing me, saying they will refund me via Google, etc, etc.
That was there biggest mistake, it gave me a total email trail which proved I never got what I paid for. I also had email from Google saying they no longer had an account, even while they kept saying they had refunded the money via Google (so not possible).
My bet, was they were hoping to string it out long enough for a Credit Card claim to no longer be possible. I suspect working on a 90 day limit. Thing was, I have 120 day limit to file a claim, and I was watching that limit. At the same time, other ebay people who purchased after me, were now leaving bad feedback with the exact same run of events as me. So I took all my printouts (their email trail, Google email, ebay feedback) and filed my claim.
Yes, I got my money back and then got a Bilbo statue for only $10 more and far far less pain.
So yes, always, always, always use a Credit Card, if Paypal select your bank account or Paypal balance as default payment method, change it to a Credit Card and know you claim limit, be it 90 or 120 days or whatever.