Yeah, pretty surethere is a certain point where good scores on the SAT don’t really help out that much. Maybe a perfect score will help you to stand out a bit more, but it does not matter as much.
I would worry more about doing decent on the SAT’s and very well on the extra-curricular. Too many people get perfect scores/high scores on the SAT/ACT’s and they don’t mean much if they can’t stand out from the rest.