PMO value proposition

I'm going to make a case for project management delivering revenue with my latest project. I have done a lot of analysis on task sequencing, dependencies, etc, and a lot of work needs to be lined up to hit the project deadline. That work probably would not have been appropriately lined up without a project manager drilling in. I am going to claim that the project would have missed its date by 1 month - the PMO can then claim 1m in revenue that will be accrued that would not have been without PMO involvement.