I would think any reasonable methodology would be acceptable, or at least defensible.  

The marketing methodology has to be fit to your ideal customer and product profile.  

There's a zillion threads on here discussing the pros/cons of them, but one of the big cons is their numbers are frequently not accurate and skew high, due to their methodology of gathering data. 

I guess I can't say I gave you a methodology to tackle this question.

J Scott is correct in reasoning/methodology.

They outline their methodology on their web site.

But with the right methodology, you can at least understand where you might be in the various scenarios -- and buy right.  

The methodology you describe does in fact work in buffalo but we don't quite do it the same way.

My biggest suggestion would be to find an agile contractor that is making adjustments with the times...which is obviously hard to come by.  

If it's the latter, I'd agree that it's too long and too dense, but for any other group it seems like a report that could provide real value.A few things that I would personally like to see:A better explanation of your data sources and methodology.