I've read that there is a higher percentage of gifted people among people with AS and HFA than among the general NT population, but I wonder who made this assessment and what kind of sample groups it was based on.
Personally, I think that most living people with AS and HFA haven't ever been diagnosed. I'm pretty sure that my mother is, and my grandmother was, on the spectrum. Neither of them is/was gifted, they merely managed to get by. I also think that in some countries, such as the USA, children from families with a better educational and higher socioeconomic background have a better chance to get an AS diagnosis, simply because they have better access to health services in general. Of course that skews the numbers quite a bit.
I think it's true that aspies are more likely to take a special interest in their work and often excel in their field of expertise, but that's not always an academic field. Besides, there are just as many NTs who do exceptionally well in their job or field of research and don't have any social impairments that stand in their way of success. All things considered, I don't think it's fair to say that aspies have extraordinary abilities compared to NTs.
I do understand the desire to see AS and HFA as something more than a crippling developmental disorder, but the view of aspies as brilliant geniuses with special abilities is just as extreme and innacurate, imho. If you look at the lists of people with genius-level IQ, you don't see anybody who is known for being on the spectrum or very likely to be an aspie (afaik). Bottom line, we are different but not stupid, we can often perform quite well if society gives us a chance, but we also have social impairments that make it harder for us to succeed in life.