I can understand if people get excited, and want to go up on stage to meet Bob Barker, but that's not to say I would. If they tell you to come on down, you go to Contestants' Row, and I am sure Rich covers this with everyone.
Also everyone should know which stairs to use to get up on stage, as there are arrows on the Contestants' Row podiums pointing them in the right direction. Personally I always thought that people who go up on stage right away make for good television. Another such person was seen on today's episode, when she came up on stage and kept kissing Bob Barker.