Having people trust you for 100 BTC in Ripple is the same thing as asking someone who doesn't know the difference between a private key and public key to give you a private key. In both cases you are playing on someone's ignorance of the system and promoting theft - whether you do the stealing or not.
Uhh, no. If I send someone a bitcoin in exchange for a private key, that's not theft, I'm buying vanity addresses. 