You haven't seen the studies? Prayers don't get answered, they achieve nothing but give the person praying the illusion of doing something useful.
You haven't heard any of the millions of testimonies of Christians who have received supernatural healing, freedom from poverty, freedom from their past, answers to questions only God can know, or their families coming to know God etc. through prayer?
Look at how many times God answered prayers in the bible. He hasn't changed, and it would be silly to suggest that an omniscient God has changed at all because he has no need to.