Eh, what can I say. I play devils advocate. You never know what I'm thinking!
EDIT: Wait no I didn't. I just added on to my previous thought from last night.
My conclusion: Hamachi for myself is not needed at this time. It is good for newbs that are trying out new repacks, servers, cores, dbs, etc. It's easy to use for one to ten people. It's not good for anything else than testing a small amount of people.
Hamachi Advantage: Testing server in general
Hamachi Disadvantage: Not good for professional use. Not good for servers with large population of players.