I view "unmetered" as a shiny ball though. You need to be very careful or you can end up getting less bandwidth then you would get on an metered account. It's really a nice way of saying "not guaranteed bandwidth" which may or may not work out for you.
Well, its part of their promotion I guess to get more customers. Especially now with all the competitors around, hosts must keep up on providing good service but still trying to make it as affordable as possible. =)