Luck is a far smaller factor for successful game making, than for something like writing a best selling book.
In game making, if you can produce a decent game, people will take notice, regardless of who you are. Yes, there's a small glass ceiling, but your limitations for breaking it are down to your resources (including talents) in making the decent game.
Compare this to writing. When was the last time you heard of a truly 'average' person making it in fiction? It doesn't happen. Unless you're already somebody, or have links to a group which will piggyback you, you won't even have permission to enter the room with a glass ceiling, much less break it.