(Seemingly) Irrational alliance selection decisions?

[Koko Ed]

The craziest situation I ever witnessed for alliance selection was at the 2009 FLR where 610 was a 13th seed and turned down an invitation from 1765 who had their best weekend in their history that weekend. 610 was taking a huge gamble that the other alliances were going to pick one another and they'd settle in as an 8th seed but for that to happen they would have to hope that 340 would pick their little sister team 424 which they didn't and thus 610's day was done.