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→Load Balancing
OpenVZ allows you to migrate servers live from one physical server to another. I haven't yet done that but I have done a shutdown, copy, and restart of the VE on another server and it's so easy to do that. So suppose you have a server that's a little crowded and some user starts hogging some resources. No problem. You just move a few users to another box and problem solved. This could probably be done automatically with some well configured cluster and I would love it if someone wrote a wiki page telling us how to do it.
== Protecting your Customers ==
Since you are managing the host system you can create IP filters and port blocking policies that help keep users from exploiting you or keep hackers from exploiting your users. Instead of a separate box that is all theirs you have them in a more managed shell allowing you to keep the inexperienced out of trouble. This provides them with a service that it watched more closely allowing them to do their own thing, but keeping you closer by to keep them out of trouble.
= Cost =
The cost savings are rather obvious. An entire rack compressed into one or two computers. Picture the space and power savings. The greenhouse gasses not being generated by the power you're not using. The number of computers that you are not buying. The hours you are saving in setup time and administrative time. When it comes to saving money this is definitely a winner. You can take that extra money and pass some on to customers and keep some extra for yourself.
