@sgene the iNat team has not really considered an external reputation system, wherein an established expert of a taxon can be new to iNat and their IDs “count” more than someone else’s but we are definitely exploring an internal one much as you described, based on one’s ID history on iNat. It is, however, a complex thing to bring into existence. Like Tony R. said, it probably won’t work as well for obscure taxa, but could help with things like students getting each other’s observations to Research Grade, vote brigading, etc.