For example, Rih being sued for $6.4 million yesterday for plagiarism would probably cause her stock's value to dive. Whereas OTR tour being valued at $100 million would give people incredible incentive to buy Beyoncé stock. But here's the catch, the people who believed the flop tour rumors from yesterday would have sold their shares out of fear and the people who stayed would reap the benefits of increased stock value for keeping faith in the brand.
In essence, it's a way to quantify bandwagonning. That's basically what real stocks are, bandwagonning for a company cause you think they'll do good.