Ah, I see. Because without the original content, you wouldn't have posted anything. But then, if you hadn't posted your stuff, maybe the one you're featuring wouldn't have been spotted.

It's not as clear cut as a 50/50 split because your comments hypothetically add value, otherwise why would you provide additional content instead of just re-steeming?

But you don't know the value you add, because the community decides that. But there's no way for the community to indicate that on your post.

Well, the community can up vote you and then up vote the linked article, to indicate there was value, but it's a bit of a guessing game as to what the real division of value is.

So, make part of random.

Take the amount remaining after curation, split that 50/50. Then generate a random percentage to further remove from your cut and use to increase the amount going to the original post author. The ceiling of the random percent can be based on how much value you think you've added by providing both follower eye-balls and by adding your commentary.

Or roll dice...

Edit: You could actually write a python script to do the work for you after the payout happens. It could do the math on the post and do a transfer. It could even post a comment to the bottom (or the memo, or both) for more blatant disclosure of how much was sent for why.