DETAILS

I've been researching web hosting solutions in Japan. Based on this question one of the services available seems to be a VLAN. I've read about the advantages of such a system for a large organization, but there doesn't seem to be much information regarding smaller setups. I take that to mean that for one server it is likely to be unnecessary? My concern is that I don't know how many other servers are on the WAN, so regardless of how many servers I use a VLAN might still be a good idea.

SERVER INFO

One dedicated server would be used. It would not be virtualized.

My Research so far

Based on comments here, a VLAN would be useful for mitigating these problems.

• A user on another server could, either mistakenly or maliciously,
  assign one of your IP addresses to their server, resulting in a
  "duplicate IP" situation that would cause connectivity issues.

• A user on another server could poison the arp cache and potentially redirect traffic to snoop on communication intended to/from your server. (later in the discussion this point was said to be unrealistic.)

QUESTION

Is it worthwhile getting a vlan for one dedicated server? Will it be easier/the same/ harder to manage?