In 2002, Poor Data Quality cost the the US Companies $600 Billon a year.

This was the result of The Data Warehousing Institute (TDWI) study in 2002. The study was based on survey data from 647 respondents.
What i find interesting in this study is this:
“Almost 50 percent of survey respondents express no current plans to implement an initiative to improve data quality, while 78 percent said their organizations need [...]