I recall a survey that was being discussed on the Dave Ramsey show. In that survey it showed how people will talk about various topics while clearly avoiding other topics.

The single most avoided topic was debt. Dave went through the list and it was amazing what was said. More people will talk religion, sex, and politics before they will discuss thier debt with you.

So yeah it may be an iceberg story only because the tip is visible but the numbers below it are much more (not less) then what is discussed. Because these instruments are not recorded we have NO CLUE. Nor do any appraisers! Hooray!!!