So, the reason why Cryptopia isn't trading this anymore is because the coin was hacked on their site, and Tradesatoshi is running the wallet and trading successfully? Isn't that a breach of contract for Cryptopia?
From what I understand cryptopia has a security issue with the way they credit deposits. Someone was able to use the low deposit confirmations to double spend and withdraw funds that weren't actually deposited.
This explains in a little more detail how the double spend was successful. It's about CasinoCoin but applies to other coins which were 51% attacked. The main concerns (IMHO) are the relatively low number of confirmations needed for a coin with a low hashrate, and that once confirmed the deposit transaction is assumed immutable and is never checked again to see if it has been invalidated by a competing chain. A simple automated audit of recent deposits would have clearly shown there was a problem and mitigated the losses.