They're playing a very different game than the OF game. They're both looking to do the high-end "real model" thing. They'd both be able to monetize that by marrying well. VERY well. I'm actually less surprised by their decision NOT to do a ton on OF and more surprised by some of the girls that have gone from zero-to-pornstar in under 4 seconds who probably could've played it differently and made out big in the marriage market.
That's an understandable position, but I suspect not one that most girls would share. Most would rather be real models and cash that in with a pro-athlete, actor, rock star or business mogul than an OF babe sucking on dildos or doing live sex shows. I'm not judging it, but I think that's were most girls would come out.