Or, as I as just told, sometimes, the director says "You have to take 6 from my facility, or you can't take any at all!" meaning the organization needs to find more hosting families.
Frontier Horizon is currently looking for more hosting families! Go read their website to see how hosting works, and if this is a way you could help an orphan, contact them! The trip in August is short...just 3 weeks. Three weeks for an orphan to see there is a world beyond the orphanage walls!