I think faceking started this same thread a long time ago. There's no such thing as "too beautiful for porn." In affluent countries like the United States, sure, it may be less likely that a very beautiful woman would turn to porn when she could instead easily be a model or actress or trophy wife... but take Eastern Europe for example, the women there are absolutely gorgeous, but the economy sucks so bad working in the porn industry is probably the best gig most of them could hope to land short of being scouted by Victoria's Secret or something. $600 for one photo session is pretty good in a place where many people don't make that kind of money in 3 months.
Also, not everyone considers working in the pornography industry to be a bad thing. The traditional view is that the women in this field are being exploited... but most of the women working in the industry don't feel that way. and for the ones that do... it doesn't really matter how beautiful you are I've found, you can still have low self-esteem.