Cool! How do you define a “high-quality” pubkey?
Thanks for bringing this up, here is a chart that's long overdue. Events/pubkeys per relay in the last 7 days.
https://stats.nostr.band/#relay_writers
I can't measure their read-load obviously, but can tell how much events are written. As I expected, the list of top relays by number of events is materially different from list of top relays by contact list. Does this tell you anything new/interesting?