I stopped buying cheap blades, so sharpening is a really good idea. My nearest Rockler has a sharpening service, but I like the idea of checking in with a cabinet shop and finding out who sharpens their blades. I have also given up on thin kerf blades, which flex just enough on cuts to annoy me, or enough so miter cuts are just a tad off. I have a Freud industrial full kerf blade that has extra thick carbide tips that is meant to be sharpened several times. I don't think I'd bother sharpening a cheap blade, such as the ones supplied with a saw.
The more I do, the less I accomplish.