I would argue that their bias is a little more subtle. Yes, they want grant money - who can blame them? - but on a deeper, perhaps unconscious level, they want to be important. Everyone does. And what makes an AI expert important? The idea that AI is going to take over the world, cause a huge impact, etc. So we have this idea that AI will be the equal of the human brain some time soon even though the neuroscientists (for all their talk, which has similar motivation) still don't understand quite how the brain works.
It's all well and good to say the brain is a finite object that can be emulated. But a fruit fly is also a finite object, and one that's a hell of a lot smaller than a brain, and we're far from emulating one of those.