The Need For Supercomputing - Some Examples

Scientists - Verify or disprove things and get their work done faster...
Engineers - Simulate things (Car, drugs, aeroplanes...) in ever greater detail before producing expensive prototypes or production systems
Retailers - Examine sales records to tailor there marketing and production needs to the most lucrative market.
Airlines - Optimise the carriage of passengers on their aircraft - fill flights, understand route-trends, mine data for valuable information.
Financiers - Make vast profits by capitalising on the intelligent probabilistic prediction of stock mark shares faster than their competitors.
Consumers - Access to movies, down load to the home.