I thought this until I read an article in a magazine (UltraMarine) with an interview with one of the best shops over here, and they said about how many people are supported by the sale of a wild coral- the guy who collected it, his family, wholesalers, etc etc etc and basically that it is important to carry on supporting them otherwise they can go to less sustainable methods which would not be good for the hobby, and therefore the shop sends a proportion of the money they make from their cultured frags, back out to where corals are collected, I if I remember correctly, to keep the hobby sustainable.
I read the article ages ago so can't remember it that well but have it home so can try and fish it out for you, if you want.
Jeff.