Okay so like while we're being trolled, here's a bit of a theory, though I'm not really sure how it would affect the plot at all
Apparently there are 48 astrological signs in the troll's universe. There are 12 in the human's universe, those 12 being those of the players that created it (the trolls). Therefore, one can postulate that the troll's universe was created by a Sburb session of 48 players, and that if the kids actually succeeded they would make a universe with 4 signs.
There's a mathematical progression here: x*y=z, where x is the number of players in the session, y is a number that increases by 1 with each larger game, z is the number of players in the next session. You need at least two players to play Sburb (client/server). So starting with that we get:
2 x 1 = 2
2 x 2 = 4 (kids)
4 x 3 = 12 (trolls)
12 x 4 = 48 (trolls creator?)
48 x 5 = 240
So following this progression, the session that spawned the universe that spawned the session that spawned the troll's universe would have had 240 players. This could continue on to quickly reach the proportions of a real MMO (by the tenth game, you'd have over seven million players).
However, it's more interesting to think about the reverse; if the kids succeed in making a universe, that's pretty much the end of the line. Being so near to the minimum, could that have some significance about why the kid's session is (likely) a null session?