Handling High IQ people

Why it is difficult to handle high IQ people vis a vis handling people with average IQ.

Is it they are too inquisitive, demanding, impatient? or they are so many positions in a company that require person with such calibre.

Anyway, i think such people are an asset to the organization and successfully integrated while adding significant value to the organization given the propoer role, challange and responsibility...ala insourcing concept....i would like to look at how such HR is handled in companies like Nokia, Ericsson, Motorola and our very own Infy, wipro etc.