American’s seem to be much more tolerant of the ringers than we are in the U.K. A couple of very blatant ones have won DWTS, Nicole Scherzinger and Jennifer Grey amongst others.
They had ice dancers on there one year and one of them won - they're way more ringery than even Ashley Roberts. The American show is just a total different beast, it's all about the big productions as opposed to watching a celeb learning how to dance hence why they go for plenty of younger celebs and at least a few with some dance experience each year.
In the most recent season alone - they had a Disney kid (they always have some dance experience), an Olympic figure skater, a Backstreet Boy, someone who had done extensive dance in college, someone who coaches cheerleading for a living and someone else who teaches dance. Poor Carole Baskin didn't stand a chance!