I have an Eaglewing Talon II, which is a static tip, and it's incredibly quiet. My friends at the range were amazed by it. I can't say enough good things about Steve's bows.
Same goes for Kevin TerMaak's RERs. My friend has two RER static tips (an XR and a set of custom limbs for his Type A magnesium riser), and they're awesome. The custom limbs are 51@28", and they shoot a Beman MFX 400 at 197fps. That's with a 50-grain insert and a 125-grain tip.
So to answer your question, yes, I do think a static tip can make a bow quieter and a bit faster.