One important thing is that the vehicle was entirely self contained with no dispensable fuel source, and it's completely reusable. Rutan may be a bit of an odd duck, but ya gotta love 'im!
Here is the rule for receiving the 'X-Prize' award.
The X Prize contest calls for launching a manned craft to 62 miles, generally considered the cusp of space, and returning it safely to Earth. And then doing it again within 14 days. The craft must be able to carry three people, although the contest rules permit contestants to use one pilot accompanied by equipment equal to the weight of two people.
The X Prize is financed by private donors. The list of supporters includes Dennis Tito, an American who spent $20 million to fly on a Russian craft as history's first space tourist, Erik Lindbergh, a pilot and grandson of Charles Lindbergh, former astronaut and U.S. Senator John Glenn, and movie actor Tom Hanks.