I think the business segment is often overlooked and depending on how the host has things setup it may indeed be a better setup over shared. We offer business hosting within our plan structure and there is a big difference in support and feature sets.
Guaranteed Support Times
Dedicated IP address
discounts on other products (design, programming, etc)
Offsite backup accounts
free migrations to dedicated server (s)
Things like that can easily warrant the extra cost. However I would imagine there are places that can brand their products as "business hosting" and change nothing, of course that is where research helps alot.