There are groups that play together. The main reason most games are played alone is because the lobby isn't as busy as it was in VMK...when there were thousands of players playing everyday. The game has a built-in minimum number of players required for a game to start, but that has been bypassed in it's current form. Perhaps when Pirates is released, more people will be playing, in general, which will help with the loner fw games.
Find/make friends with people who play a lot, though...most of us enjoy playing together quite often...usually late at night these days.