User blog comment:Night at the Kashmir/My Theory why Sally was really sent to Fontaine's./@comment-3967731-20140925213320/@comment-24769282-20140926022840

Apart from his and his companies image (despite the take over already having a negative whiplash in the eyes of the city's citizens), it's an Orphanage, meaning a free service and altruistic. It could be possible that Ryan didn't know what significance the girls were to Fontaine until he hired Suchong (it's implied that Suchong was capture and offered a position sometime after the Department store was converted into a prison), so they were let loose onto the streets.

He couldn't run after the orphaned Little Sisters for many were, by then, taken in by people, such as "Booker" or Cohen. So I'd believe that Ryan thought, "why the hassle, just repurpose one of Fontaine's assets that could pass as legitimate business", an Educational Facility. It could be that Little Wonders also had housing similar to dorms in private schools so that the little girls could stay there instead of being sent home daily. After all, private schooling is stereotypically the best education money can buy.