Like you said if it gets out of hand especially if the author doesn't post organic content.. and the intent is to farm reward from reward pool without contributing to the network. Although airhawk has other utility aside for upvote it's the governance token for traders using airhawk p2p on their instant messenger groups on whatsapp and telegram, it can be staked and mined and also airhawk is market marker on the hive-engine ecosystem, there is more to it than just upvoting authors