In our experience, most companies buy dust collectors because they have to, not because they want to. Of these, the majority are trying to comply with codes to keep their operation running. The second largest group who buy industrial dust collectors are those concerned with the detrimental effect that fugitive dust has on capital equipment. Finally, there's a small percentage of manufacturers who install dust or fume collectors primarily for the sake of health and safety for their employees.
All the above are valid reasons. Is one more important than the other? To whom? What can be done to help/educate manfacturers on this issue? Please feel free to comment here and express your opinion.