I also think such research is interesting, and agree with Candy that a more realistic representation of the industry would be nice i.e. women working very hard to keep men happy and earning between ?80-250 an hour (I know there are people who earn less or more than this, especially if they hand over a house-cut to anyone, but I would hazard a guess that most indoor workers fall somewhere in this range.)
Something else I would like to see, however, is prostitution being accepted as a legitimate choice for women. Often 'she's funding her studies' or 'she can't earn this much anywhere else' is used to excuse or explain away the woman's choice to work in the sex industry. I get asked by clients all the time whether I'm paying for my studies, or paying off debts: they presume I'm in the industry because I need the money. Well, yes, maybe I do, and yes, many women are funding their studies or their futures through their work in the same way that others do with other kinds of work, but sometimes it seems like you have to have this 'reason' behind your decision if you're going to be a sex worker. It's like you have to prove that you really need to be a sex worker to achieve your dreams, or else it seems like you're just 'doing it' and it's not quite so acceptable. We've kind of begun to consider it as a positive and empowering choice, but only when it leads elsewhere.
Something similar happens here in this NSFW video of former-porn star Sasha Grey. She's proud of her achievements in the sex industry, and we begin to get a 'I'm happy with the choices I made about my own body' view, but then that's quickly whipped around to 'but it's only okay because porn is the only way to get pay equality'. The gender pay gap is incredibly important, but it makes me sad that we still can't see a person's decision to work in the sex industry as good enough on its own, without the disclaimer of 'I'm only doing this because ...'