Joining House Danaan is difficult; like Dylan, membership is usually invitation-only. Some Fae are approached by Danaan members visiting from Arcadia, while others are asked in between lifetimes, hence why some fae don't reincarnate. There is even talk that the radical sect of House Beaumayn may be on to something with their cold iron theory, since the idea was to cut off the Fae soul from the mortal world forever. Danaan recruited slowly over the millennia, but gained speed as Winter approached, hence their sudden swell in numbers.