I know several farmers who don't have much book learning but are nevertheless out standing in their fields.
Just reviewed the posts on this tread and I came to the conclusion that some have failed miserably in their attempt to justify using income approach methods in both the income and csa approaches. Just because the AI lists as part of their accepted methods in the income approach, the use of an income capitalization method doesn't mean one should apply it as part of the sca to the exclusitivity of other sca methods.
If this were a class many would be looking at a failing grade-maybe some would even have to consider having their Daddy make a big ole donation to the AI to add a wing to their library so their kid could get a passing grade!