The cost of a CRM subscription is not the only component of CRM expense. In fact, depending on the size of an organization and/or the complexity of requirements, there can be at least six different levels of CRM expenses.
Below is a chart and an associated table of CRM related expenses over a three year period for a hypothetical company with 50 CRM users. The chart and table are embedded from this spreadsheet. Feel free to save this as a Microsoft Excel spreadsheet or to make a copy in Google Sheets. From there, you can plug in your own user count and assumed per user costs.