And you'd be right, that Valve is nothing special, if that idea is correct, because in that case most companies will be like Valve. But just look around, do you see many companies like Valve? No, that's because capitalism is bullshit and that makes Valve stand out.
They also ignored the gambling/trading plague for too long, until a lot of countries threatened them to stop indirectly promoting gambling (which definitely hit them financially).
They are sitting on a money printing machine and their job is making it print no less to buy GabeN another yatch. They are like the cigarette company who donates shit load of money to the charity and cancer prevention lab while making more cigarrate then ever because people love smoking it.
I don't think they wanted or planned to be monopolized, but they are definitely taking the advantage of being it.