TradeFortress's Ripple scam is the "I'll give XYZ if you give me your private key" of the Ripple world. He's shamelessly duping people who don't understand Ripple. That's not a flaw in the underlying protocol, but it is a "social flaw" surrounding Ripple.

I seriously don't understand why people are paying so much for XRP, though. It's a system with a lot of promise and some flaws (including social flaws), but the market cap for XRP is *insane*. It's a totally unproven system. We don't even know if its fundamental innovation (the consensus system) really works in the real world.