Thanks, man, this helped a lot.
Totally get it now. I think cross-posting is an amazing new way to curate.
If an influential curator finds an extra post he'd love to reward but is worried he's used up too much SP for the day, he could crosspost it for others like him to find. That way, he helped the original author gain recognition for his work.

Since it's going to show in the crossposter's name, it would help if there was a tag to let people know he's crossposting.