I know someone who is involved in the Bloodhound project, working with a large education company over here (one of the sponsors of the car). There is a really big focus on the education side of things with this; they're touring schools and colleges doing presentations, along with a full size replica of the car. One of the big reasons for doing it is to get kids at school interested in science, maths and engineering and that seems like a pretty good idea because there has been a continuing decline in students going on to study those subjects at higher levels in the UK (and I believe most Western countries these days).
There's a bit about it on their website http://www.bloodhoundssc.com/education.cfm . I also doubt that the overall resource usage for the entire project is actually that high (I'd bet fewer resources used than most Hollywood films for instance), so if it increases interest in the areas they're targeting so that general science and engineering gets a bit more attention, I don't think that's too bad a result.