To that end, the reason why the show resorted to contestant auditions was because so much of the contestant pool was homogeneous. A lot of middle-aged middle-management guys wearing glasses who, at their best, were dad-joking their way through every stack. Most of them had no charisma and the only way they were getting on TV is by virtue of a blind test of knowledge that the show originally used. For every Doug Van Gundy or Neil Larrimore, you had 20 John Cuthbertsons and Dan Dageys. (And no, I don't expect anyone to recognize those last two names.)
Dan Dagey won $32,000 and was a customer service representative. Meh. (Thanks Millionaire Fandom Wiki, for knowing stuff so I don't have to.
I recall a conversation like this--perhaps it was with you, maybe it was with STYDFan/CarShark--but the dichotomy is there. The milquetoast folks were the ones winning the money. So if you want big winners you go with the people who can do the job.
I don't think I could have stood a parade of Dougs and Neils--it was nice to have a friendly and upbeat guy there to break up the monotony but I could relate more to the--let's say charisma challenged. I wasn't going to get on Jeopardy but I could at least dream that it could be me at center stage. When it became "have five stories at the ready and impress the PA who drew the short straw" it became a different situation.