Bidding $420 because you believe that is what will get you the win is one thing. Bidding $420 because you think it's funny (like $69) is another. One is a person trying to get up on stage, the other is a clown looking for their 15 minutes.
My grandmother, who has been watching Price is Right for 50+ years has always said she thinks they should have a rule of bidding a certain amount within others and I've always said that makes things unfair. If contestant A bid $999 and I know (or genuinely believe) the price is $1000, it's not fair that I would now have to bid something like $1025 and risk going over. It's tough because I also get annoyed when someone one-ups the last person to get called down, a crowd favorite who had been stuck in contestant's row all show, or even someone who is a clear fan vs someone clueless who probably hadn't seen a full episode of Price is Right since it started. In the end, it's still a game and has always been this way .