[Tenhundfeld]

I hear what you're saying. People use the words interchangeably, but in this context, I think there's an important distinction between fair and reasonable:

- Fairness is a moral judgment.

- Reasonableness is a logical argument.

That's why I argued that Valve's taking 30% is reasonable but not necessarily fair.

[madez]

Reasonableness usually implies more than just a logicality, including fairness. To then say that the 30% cut is reasonable means that to say that it's fair.

Let's assume reasonableness were equivalent to logicality. Then, for a decision to be reasonable, it must satisfy some logical conditions. I'd argue that is in our case maximizing a fixed metric in relation to all other possible options. One either doesn't value fairness in the decision-evaluation metric, the 30% cut is fair enough or it's unreasonable.

So, putting it all together, we get

(1) 30% is fair (enough),

(2) one doesn't value fairness prominently in decision making metrics or

(3) the 30% cut is unreasonable.

I'd say the 30% is _not_ fair (enough). That leaves one to pick (2) or (3).