While I can't argue whether 30% is actually fair, I do believe you are disregarding some benefits steam brings which may seem trivial. The hosting of online-games and facilitation of sales is not their only service. One that has traceable value that immediately comes to mind is the illusion of a central authority for achievements.
I have personally purchased many titles a second time to register my feats with steam and anecdotally see similar sentiment among older gamers. Achievements feel worthless in isolation but provide fulfillment when socially recognized. These are sales being manifested solely through Steam's position.
Now, back to whether this social permanence is worth the 30% Steam is extracting, I do have my opinions. Steam is technically "rent-seeking" from a strict economic classification, but is this more-so a case of the lighthouse or the railroad?
I have personally purchased many titles a second time to register my feats with steam and anecdotally see similar sentiment among older gamers. Achievements feel worthless in isolation but provide fulfillment when socially recognized. These are sales being manifested solely through Steam's position.
Now, back to whether this social permanence is worth the 30% Steam is extracting, I do have my opinions. Steam is technically "rent-seeking" from a strict economic classification, but is this more-so a case of the lighthouse or the railroad?