Another way to put it is that Logic deals with cause and effect situations with a correlation of 1. It's possible to have a correlation of 99%, which would be a logical error, but still a very useful bit of practical knowledge.

In this case, I would definitely agree that people that act sloppily in one aspect of business will almost always do the same in other aspects. More generally, I'd say that most classical logical fallacies are actually useful rules of thumb.