That doesn't make sense. No really. I'm not defending cryptopia, but they don't have enough resources as it is to run the exchange, they couldn't possible be keeping bulwark coins to run masternodes on their own servers.
What you are most likely seeing are people buying BWK, withdrawing them, then setting up masternodes. But not the exchange itself.
Not defending his idea of cryptopia running masternodes (could ruin their reputation completely, whatever is left of it anyway, so probably not worth the risk), but how would people withdraw BWK from cryptopia if their wallet has been closed for ages?
The coins aren't there they are being used as nodes by a cryptopia employee or owner. I don't understand why people don't get it yet