They gain transaction fees on both sides of the trade, half in USD/etc and half in Bitcoin. It is possible that they valued their Bitcoin at e.g. market for th

They gain transaction fees on both sides of the trade, half in USD/etc and half in Bitcoin. It is possible that they valued their Bitcoin at e.g. market for the purpose of preparing the accounting reports, but did not actually sell it on their own exchange or otherwise. It was, therefore, part of the 120,000 they report as owing themselves, which (if you believe the document) was looted along with the bulk of customers' coins.