2,000 posts! 
If I recall, the city of Eugene and state of Oregon gave Hynix (Hyundai) something like $50 million in tax incentives to stay. 4 years later or so they closed down! *poof* - money gone.
Subsidies don't work for big companies. Some shop around for the best tax breaks and jump around, others look for actual business reasons to locate to an area: workforce, trade/transport links, materials, network of similar businesses (suppliers and so on).