For the record, game rooms in Asia and Europe usually pay a larger monthly license fee based on the number of computers they have, with unlimited access to the game they are licensing. They then charge customers an hourly and make their margins on the difference. What the game room pays can be drastically different from one to another and country by country.
So it's actually very tricky to determine even a rough guess from simple math on X number of subscribers in those markets, because each subscriber does not count for a monthly fee in any measurable way. A more telling statistic would be X number of game rooms.
Your best bet is checking publicly available information such as annual financials and deducing from that direction.