"The thresholds at which this happens changes over time, I believe the downvote cap is at 50 right now and the flag cap is at 200."

I may be reading this wrong, but I think what you're saying is that once you reach a karma of 50, you can downvote comments. I'm pretty sure that's incorrect - I have a karma of 89 as of this writing, and (unless I haven't yet figured out how to) am unable to downvote comments. Maybe someone who recently became able to could give a more accurate number.