The main cases of those who have gotten this terrible bird flu are cases in which the people themselves were in contact with birds. Bird flu doe snot seem to be spreading from person to person at all so far so there is not as yet a huge demand for the bird flu vaccine. Especially not in most countries, Asia however could benefit largely from the use of an effective bird flu vaccine since this is where most people are catching bird flu.
The reason that scientist and the governments are so interested in developing a good and useful bird flu vaccine is because humans will not be able to stand up against the bird flu long when and if it starts being transferred from person to person. This is when we are going to really need the bird flu vaccine and that is why this vaccine is being worked on so much by the best minds in science.