The trade-off, we are told, for "sucking up" to God for a lifetime is an eternity of paradise. By contrast, being on the side of the Devil and living a life of freedom to do as we will on Earth could, according to some views, earn an eternity of pain. Under those circumstances, is the Devil really more sensible?
I just think the original question was badly phrased, since it's clear the OP already "knows" the answer and has put it in the question. You can see prayer as God being a bighead, or as God being a normal loving parent, albeit one who doesn't take too kindly (understatement) to being ignored.