What I don't understand, is that you claim to find the FTP pugs to be dull, yet you don't want to play in a full 10V10 24 against people outside of Sanc?
I understand that you're saying you're looking for premades for real competetion, but isn't a little undermining to assume that just because ten people aren't all from the same server and guild, they can't provide an adequate challenge for your guild.
Now it would be entirely different if Sanc had a history of playing these smaller guild groups, or real ID teams, and had beaten all of them without any flaws; but as that sort of evidence does not exist, why would anyone believe you'd be above playing teams that weren't all entirely from the same team?