Having worked retail and customer service jobs firsthand, and having friends (and obviously coworkers) that have as well, I'd assure you that the statement you

Having worked retail and customer service jobs firsthand, and having friends (and obviously coworkers) that have as well, I'd assure you that the statement you quoted is accurate for the majority of those workers. Most people leave for any other job the moment they can, and those who can't get old and bitter.