User blog comment:Otakon7/Otakon7's Buddyfight Simulator/@comment-24915410-20140730195531/@comment-2234004-20140730200649

Well, most people are online when I'm asleep so I can't give you exact numbers, but there seem to be at least 5 people online at all times (just note that just because the main lobby is empty, doesn't mean there is nobody there, it just means they're playing).

As for what people play, I don't know, they have decks for all worlds but they tend to play the latest stuff (to test it out).