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Hi Dean
We have not done a return on investment study of the Kenogami House, but for a general opinion of whether or not it was worth it, I would say no, not really. That house wasn't about finding the proper balance of insulation, it was more an excercise in resilient home design and extreme passive heating.
The house is certified LEED Platinum but also meets Passive House levels of performance (and then some), but it does go beyond what we consider to be a resonable return on investment in terms of insulation levels.
That said - in general, the answer is yes, you are better to increase your performance levels beyond those required by code. We don't have a specific cost analysis done but we do have an article that details the variables that should be considered, have a look at this link, and be sure to check the comments section in that article as well. Best regards.