Dude your first SOS will drop your plunder significantly. Get the coes going first, and buy the SOS when you can afford it a little easier
Yes it would (/)_-) SOS lowers ally plunder unless roughly 33% percent of your spy buildings are SOS.
I'm saying your new SOS will be less plunder than your black guild. Upgrade to a coe lvl 1, it's better plunder than the guild and a tasty stat boost.