Of the 11 Dancing With the Stars competitors, I had heard of 9 of them before tonight. About what I expected.
As for the hard-hitting science portion of this list: In my win odds The universal 1-10 scale is used for the Surprise Their Doing This.
Also please note well that, "Surprise They're Doing This" took in to account my surprise that they were deemed famous enough to warrant an invite. And by "warrant an invite" I mean, "Their agent convinced the DWTS booking agent to acquiesce to their begging."