Looking at Zoho One we're actually thinking about going all-in for real. Zoho One is a subscription that gives you access to almost everything Zoho has - Mail, Workdrive, CRM, Desk, Projects, etc, etc. It's $30 per month for every employee.
We've looked at it, but the price just doesn't work for us. Even if we bought every tool that every person would ever use, we don't have a single user who comes up to the $30/mo price. Most are in the $3 range, so the gap is huge.
Our core users are mail, workdrive, and connect. Beyond that, everything is unique to a role.
Yes, I think it hard to come up in price for the common cheaper services and only makes sense when you have a high percentage of your workforce on one of the more costly things like Zoho Desk or Zoho CRM.
The enterprise edition of Zoho CRM for instance is $35 per month. Enterprise edition of Zoho Desk is also the same price.