A sermon's native home is in the context of the gathered church at worship. In that setting, a sermon is bolstered by liturgical actions like confession, prayer, singing, Scripture reading, and passing the peace, as well as sacramental actions like baptism and Eucharist. I know that extracting a sermon from that context runs the risk of reducing its significance and force, but I still read sermons for two reasons:
1) My own faith has been greatly enriched by reading sermons that were originally delivered by people I've never met, to people I don't know, in places I've never been. The ways of God and our shared human condition, it seems to me, are similar enough to bridge the distance.
2) I think that sermons are one of the best vehicles for offering the instruction and inspiration we need. Sermons can provide a thorough engagement with Scripture and life, without shortchanging either of them. More than a mere transfer of information, sermons aim at life transformation.
My conviction about the goodness of sermons was confirmed by Stanley Hauerwas, who said, "I am convinced that the recovery of the sermon as the context for theological reflection is crucial if Christians are to negotiate the world in which we find ourselves" . I could not agree more.
 Stanley Hauerwas, A Cross-Shattered Church: Reclaiming the Theological Heart of Preaching, 12.
Book Review: The Peaceable Kingdom by Stanley Hauerwas
Today's Learning is Tomorrow's Teaching