Nope, it doesn't, and in an ideal world we might just go right ahead and give 100% to authors.

But in the real world we need a system with sound economics in order for authors to be rewarded at all and that requires the curation share to be higher (indeed maybe even higher than 50%, but we are hoping for various reasons that 50% is high enough to work).

Think of it as a necessary evil if you prefer, rather than the straw man of someone making a claim about equal skill, sweat and effort, because no one is making that claim.