The funny thing is: 600000 octos wont make anyone rich right now, and are definitely not worth a few months of masquerade.
And if they really wanted to, they could have easily pushed the price. Fancy faked video, faked screenshots, tweet storm, whatever. But they didn't.
Quick money is not what they have in mind... but what else??
EDIT:
Actually there are just three possible explanations:
- They are legit, just accumulating coins and working on their projects as planned
- They are legit, but the project somehow failed, be it due to personal reasons or issues with investors, or maybe the current bitcoin price scared them away
- It was a well planned scam all along, though very unlikely