A sharp ice screw can be placed much more quickly & with less energy than a dull one. A sharp ice screw also provides a more secure placement as it causes less fracturing of the surrounding ice. And let's face it, if you NEED to get in a screw, you want it to go in easily and quickly. The most efficient way to place an ice screw is in your batting range (waist to chest and in front of you), but that's not always possible. Sometimes you want a placement above you and to the side while in a delicate stance. You WANT it to go in like a BRAND NEW SCREW!