Actually, dubs are good for the economy. Consider:
1. Since they believe there is no future, their savings are low. This keeps currency in circulation.
2. They burn tremendous amounts of fuel, which provides profits for oil companies.
3. They utilize nearly obsolete, but still functional assets (such as 1940's clothing, and old mini vans), that would otherwise be wasted.
4. They spend their vacations in otherwise vacant hockey arenas, providing civic revenues and keeping hospitality industry dollars in their own communities.
5. They provide a low-cost, reliable, form of labor. After all, someone has to clean the toilets. Just think about it - if you were a janitorial contractor, where else could you get a floor scrubber who was capable of addressing 10,000 people?
So, maybe they do provide some usefulness to society.