You know that some Thesis are made about the success of Riot and Zynga in some MBA right?^^
But if I had to give few reasons (as important as yours), it's would be the internal strategy, the early korean implantation, the fact that LOL has been made for European market (where Panzar is dev for Russian market), the fact that Dota is based on warcraft license, the pro-gaming plateform...

But go ahead, [email protected] I'm sure they will pay a fortune if you can make Panzar as successful as LOL like that