What? That's not right at all. There's a reason celebrities/rich people try to hide who they are when they're on the show. Other Survivors -- rightly or wrongly -- often justify voting them out by saying that they don't deserve the money. That's why Jeff Kent didn't tell anyone who he was, why Russell Hantz didn't tell anyone he was an oil millionaire from Texas, etc.
That said, I think that Penner revealing Lisa's background was only partly that (even if child stars aren't really known for keeping their money into adulthood). The other part was that he was pointing out that she was an actress, and that she'd made a living pretending to be someone else...if you think about how often people in the final two or final three try to emphasize that they and the friendships they formed were genuine, letting everyone know that the person has a background in being professionally fake torpedoes that argument (not that they showed her making it, of course).