I know what you mean. I've been doing semiprofessional papercrafting for over 25 years. You use scalpels a lot (think exacto blade holder). In one of my first paper classes the instructor said to go out and buy 100 blades and use them! I've always remembered this and when I started quilting, I started buying my rotary blades in bulk and change them often. It makes cutting fabric so much more pleasurable, accurate and I believe a sharp blade is safer because you aren't fighting with your cutter.