Rovio’s CEO Steps Down After Just Over a Year

I still don't understand how the market overvalues all these "one-hit wonder" companies, like Rovio, Zynga, King, OMGPOP, etc., and how they grow to such massive amounts of employees (it's kind of a "curse of success").

Edit: the proper URL should be

http://www.theverge.com/2015/12/9/9878424/rovio-angry-birds-...