There can be lots of reasons. Some people want to do different types of posts or may use it to run a community. I did @tenkminnows to support small accounts and people can delegate to that so I do not benefit. I have no plans to take anything from that account. There is the risk that some could use it for spamming and fraud so that needs to be spotted and dealt with. Squatting on typos is common on the web too so we should not be surprised to see it on Hive. Anyone can create as many accounts as they want via RC or by paying so that is why I think there should be more of a cost.