>
>
> It also presupposes the self-ownership thesis; a doctrine G.A. Cohen has
> argued, rather convincingly, leftists should abandon.
>
If our concept of value is scientific it shouldn't be affected by what moral theories we adopt. I'm skeptical of the utility* of "value" as an economic concept in general, though.
Sports are a weird market. Star athletes' production point is positional. There are huge subsidies. &c.
*I'm terrible, sorry.