Kellie was a personality too, just not the greatest singer! Ace , Bucky and Mendesa all filled a role! The more diverse the better entertainment value. They can reach a much wider audience of all types, genre's and shapes of people.
The ultimate goal is to crown an Idol but the secondary role and why we get to see it on tv....is for viewers and ADVERTISING Dollars . The more viewers the more $...why do you thnik they had the bucks to sign Randy, Simon and Paula to multi-year contracts. They are making ALOT of $$$