Most people dont have 4k to spend on rims/tires, so as the economy sinks companies are going to do whatever it takes to stay afloat.
You also have to look at the market in which vossen is in. unlike work and other companies like it, vossen is not a wheel that people use to race with.
So why not appeal to both sides, work, bbs, ccw, ssr are all wheels that are used in several types of racing. therefore people are going to buy them due to their strong nature and build quality. Also race teams have the money to buy these wheels, therefore making it easier to stay in business.