I have to agree with Jerry on this. I've seen it as a common problem. People don't understand how the products work together.
Ripping it all out sounds like overkill. Depending on overall ventilation in the space and insulation compaction it may or may not be a problem.
Sounds like a good opportunity for additional revenue.
- check existing moisture levels, monitor for the next 30,60 days with repeat insp during different weather patterns, etc.
- give report on acceptable levels (by manuf. standards) etc. and current levels etc.
Read 'consulting'

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Accurate Inspections & Consulting, Inc.
773/844-4AIC
Markus Keller