Some more estimates of the cost of Poor Data Quality

Larry English writes this in this article:
Quality experts agree that the costs of non-quality are significant. Quality consultant Philip Crosby, author of Quality is Free, identifies the cost of non-quality to manufacturing as 15-20 percent of revenue. Juran pegs the costs of poor quality, including “custom complaints, product liability lawsuits, redoing defective work, products scrapped [...]

Poor Data Quality Cost 10-20% of revenue

Thomas C. Redman writes in this article that: Poor data quality costs the typical company at least ten percent (10%) of revenue; twenty percent (20%) is probably a better estimate.
Larry English writes the same in this article.

Poor Data Quality cost 100 largest Danish companies 4 Billion DKK

This is the result in a study PA Consulting has conducted in Denmark. They also mean this figure is a conservate figure and the real cost is probably higher.
Another result is that you can save 3,5% in purchasing if you have good Data Quality.
The question is why the management let this happen, and the conlusion [...]