The procedure for creating human intelligences is well-established. It's rather time-consuming and the results are of variable quality, but it's worked well enough to produce 7 billion instances. The only reason to replicate human intelligence in a machine would therefore be to see if it's possible. The expense and difficulty tend to rule out this kind of idle curiosity.
The main aim of AI (at present) seems to be replication of human cognitive capabilities. The payoff is that the machine can then be made to exercise these capabilities faster or more reliably or in situations where meatware has problems.
Biting the hand that feeds IT
