I'd say that around 90% of the industry girls I know who escort on the side enjoy it less than performing in films, despite the financial advantages.
A lot of the girls are attention whores and need a roomful of people praising or watching them. Then there are the clients. Some of the stories I've been told would curl your toes. Yes, big money changes hands, but most of these chicks would rather rim De'Bella in their parents' lounge than revisit the experiences.
Hooking is good money, but in porn you get to hang out with your friends, have a giggle and not have to 'act nice' to anyone in particular.
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I also am subcribe to postal pornography - CAOH