It's much easier to get bored doing nothing than doing something. I'm assuming that bolting owners during the wait for worlds to fill are doing so to take their credit to a world closer to filling. If the first world filled more quickly, I don't know that I see a likelihood that someone like that is necessarily going to get bored. To some degree, the opposite is actually true (owners wait and lose interest). Of course, those tend to be those "new" owners that join (only) to fill worlds.