Earlier quoted context omitted.
> Also why steam is still the leader despite having a terrible UI: they have been very good to their customers. Steams core customer is the game developers/publishers, who they take a ~30% (last time I checked) cut from the profits from. The people who buy games are simply users of Steam, and Steam has to treat them well, otherwise their actual customers (developers/publishers) won't get as much profits, and indirect…
Developers don't pay that 30 percent, users do. You could even say that steam is a customer of the developers (I buy your game at x to sell for y), and the average person is a customer of steam and the devs. I don't really see the customers or the developers as the core. Both groups tie into each other in a big network effect.
No really, the developers have 30% removed from a sale which goes to Steam. People who buy games don't see a price + 30%, it's the developer who sees the fee when they look at the sales. Otherwise all receipts from Steam would be $GAME_PRICE + $STEAM_FEE, but it's simply $GAME_PRICE and then the developer when looking through their sales, that see $GAME_PRICE - $STEAM_FEE.