According to a survey by Manpower US in December 2011 :
http://www.cbsnews.com/8301-505125_1...ve-their-jobs/
84% of workers are planning to leave their jobs and only *5%* plan to be in the same job in 12 months time.
Deloitte Index's Shift Survey (20210) says 80% of people hate their jobs:
http://www.businessinsider.com/what-...ur-job-2010-10
A 2010 UK survey conducted by
http://www.caterer.com not only shows 70% of workers overall to be "miserable" in their jobs, but also provides a breakdown by industry:
http://www.10yetis.co.uk/releases/caterer-workers.html
(The highest figure of people satisfied with their jobs - 49.16% - is in the hospitality sector which is the closest equivalent to the sex industry)
So even in the unlikely event that the unsubstantiated 90% guesstimate were accurate, it is hardly unusual, and taking in to account the numbers of survival and crisis sex workers, might even be below the norm.