As much as I love capitalism, there's a few differences as you go up in tiers beyond just room limits. Today the most notable is the ability to manage more than one office location. In time it will will expand since certain things (i.e. SAML, high resolution analytics, audit logs) aren't needed by the typical 5 conference room company. The more stuff you're managing, the more complex the relationships become -- not just an N + 1 operation.