The one admittedly selfish reason why I would like for there to be a higher power is that I would feel good knowing that (assuming that this higher power comes with the afterlife package deal), somehow, my deceased relatives and friends live on (in a good sense).
As for myself, meh. The concept of living forever, as strange as this may sound, seems exhausting to me. I think you could find just as much peace in an eternal "rest." I know that an afterlife, if you live good and whatnot, is supposed to be amazing beyond anyone's wildest imagination, and some say in heaven you can get whatever you want. Let's put it this way: For me, whatever I want is a long, long nap. I don't want my life to end anytime soon, but I can't imagine myself being too thrilled about the concept of another life to go to. If that makes sense.