Maybe something happened to the owner/operator? Dead? Ill? Held hostage?
TradeOgre was run by anonymous individuals, but there is no way it would have been a single person, should be something like a team with a few people in it. So even if something goes wrong with one person, i don't think that should bring operations to a complete halt, except they all lived and moved together, which is very unlikely.
I'm still leaning towards an exit scam, until there is new information.