Electrical power consumptions: If the population of AIG machines becomes more than humans, they can contribute to the daily electric power consumption since they will all depend on their rechargeable batteries.
This is a concert poiny, one of which has made the Artificial intelligence machines given a second thoughts, aside the other motuves by the media towards the introduction of artificial intelligence, thinking they will one day compete with humans for power and resource control. Movies like sky net and the terminator speaks of these fears.