"She's doin' it for the Big Girls.", one of a group of big women said as she was watching Kirstie Alley dance on a nearby television screen.
Dancing With the Stars (as are all voter-elimination reality shows) is a popularity contest not a talent show.
The producers of DWTS chose each contestant based on his or her ability to attract any given demographic segment for it's audience.
Why is Kirstie still on the show?
Because there are a whole lotta' Big Girls who can identify with her.
Hines gets the jock vote, The Karate Kid gets the '80's vote and that blonde girl gets the youth (or horny old men) vote.
Not a talent show.