In the past, I have seen a very small number of job postings that referred to Crystal, but I believe it was always in a list. The organization was looking for people familiar with different agile methods and listed several, including Crystal. However, a quick search of job sites today isn't revealing anything.
The Crystal family of methodologies - the intention was to have several, based on the staffing size, complexity, and criticality of the product under development - was developed by Alistair Cockburn based on interviewing development teams at various organizations having different levels of success at their efforts. Crystal Clear was the most detailed version. Other methodologies that saw wide adoption, like Scrum and Extreme Programming, were developed and practiced by real teams on real projects before they were developed.
I'm not sure that Crystal was ever something that was meant to be used. Crystal Clear and Extreme Programming share a lot of the same core concepts, but it always seemed to me like Crystal was more a way to help organizations think about the practices they use rather than a methodology or framework to be deployed.