Concisely put. Whenever I'm doing a business case internally for my company (if I want us to invest in anything) or externally to a client, I'll do some kind of "and here's the size of the prize" slide. This usually takes the form of newspaper clippings / internet headlines that show fanciful numbers of people in need of the product I'm seeking to develop.
But I'll jokingly say "let's be honest, none of us care about that" - and immediately move to the next slide where the real meat is.
This slide is my Sales Funnel. It shows exactly where the sales are going to come from, how much the infrastructure will cost (with sensitivities to say 'if something doesn't work, we can shut it off'), backed up by what I know and can produce in terms of evidence about the customer base.
Thank you for producing this Aaron!