If/when Hive ever gets to millions of active users we will see a lot more spam, but then posting may get more expensive in terms of RCs. It's going to be hard to police it anyway. Abuse is bound to happen and we may need to concentrate on specific aspects to have any hope of controlling it. Manual voting helps as people can at least decide if something deserves rewards.
My main concern is that HW can scare people away when they might have been good for Hive. Some will make a mistake, but not hang around to do their penance if found out.
The penance is also quite ridicolous!