I guess that holds true as most players know when it's appropriate to throw the SC into play. Since I only went up to gold league before going into a guild, there wasn't much to do in the lower leagues other than just take the sectors, making sure the guild is in a good standing, and wait until promotion time.
As with
@Yekk's response, the lower leagues will probably be not affected since there is very little progress to be made in order to earn a spot to get promoted. Copper hardly sees anyone going for the sectors (you'd be lucky to see 1 guild doing at the same time as you); silver, maybe 1 or 2 guilds to spice things up; gold, about 3 or 4.