They get the profits - you lose your house. Your Gedcom file has some. Even if absolutely everything came from documented sources - your Gedcom has some because those documents were prepared by people. They made mistakes. They also sometimes were not entirely truthful for one reason or another.
Some sources are better than others.
The gentleman who came to the conclusion that William Frazier Galloway was the son of William Galloway because they had the same name was in error. He published this information. CD's are like print - hard to correct once they have been sold. More and more people are discovering they have wasted a lot of time chasing these errors. And more and more people are regretting now having their past mistakes eternally floating around people's computers like a bad virus with no way to correct it.