I have well under 501 karma, and I'm able to flag articles as well as vouch for dead ones. I think your idea of limiting the number of flags a user has per day

I have well under 501 karma, and I'm able to flag articles as well as vouch for dead ones. I think your idea of limiting the number of flags a user has per day is a good one. I'm kind of surprised that isn't the default behavior already...