Being a celebrity myself and often being seen to be endorsing the game. I would have to say that of course it works.
<hee hee hee>
I doubt if the game would be here if it weren't for celebrity endorsements. We were lucky to have the BBC Click team as fans, especially Kate Russell who not only worked tirelessly, but her understanding of how social media works paid dividends. There was a surge in Kickstarter funding when Dara O Briain tweeted about it.
I actually suggested it years ago to have a Star in a Reasonably-Priced spaceship. Stick them in an Uber-ship. Tell everyone where they are and where they're heading. And see how far they can get before the sheer number of the great unwashed takes them down. It's a game of skill and popularity because the celebrity could appeal to the players to help them on their way.