It might be different now, but I'm pretty sure back in the Bob Barker era contestant selection wasn't random. The entire audience had to introduce themselves to the producer one by one and answer his questions about where they were from, what they did, and if they were there with anyone. The people selected were fairly attractive and charismatic. The selection also leaned toward people who came with larger groups. I assume so they could get camera shots of cheering and helping during the games.
I agree. In my grandfather's case, he was keeping this all a secret because he wanted to surprise his family with financial help from his "windfall." Something I think he always wished he could do, but never had the money to do.
My 85 year old grandfather didn't commit suicide, but he was taken for every penny of his meager life savings by the Jamaican lottery scam. My dad discovered what was going on, called the police, but was told there was nothing they could do. My grandfather firmly believed and probably still does that he had won the lottery and was just waiting for a payout. We basically had to revoke his phone privileges to keep him from giving them more money, because he was so convinced. He does't have Alzheimer's or dementia. The scammers are just very convincing.