I think 1K makes sense for reasons mentioned.
But keep in mind, this has a material affect on the dynamics of inter-bread persona development for a user ID (doesn't apply to namefags). Also on anon engagement with a bread, if they 'see it through' when participating.
Another way to mitigate bread consumption would be to discourage the "Hi Q", "We love you Q" faggotry that follows each Q drop. Let our digging and memeing reflect our love and appreciation - by our works we will be known.