Every time you work with a knife or other blades, it's important that it's as sharp as possible. The blunt blade is inaccurate, difficult to use, and directly dangerous too. When you have to apply more power to blunt blades, you risk sneaking and self-destruction and other people. That's why it's very important for anyone who regularly works with any bladed edges to regularly sharpen their tools. The blade sharpener, therefore, is very important for people from many crafts.
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The knife sharpening tool comes in a number of forms – from a simple but effective round file to the stone manual or automatic group, and more modern gadgets that do all the work for you, there is no reason to work with a blunt knife. Why take the risk of body losses and go to extra efforts to try using a blunt knife when you don't need to do it?
Good knife sharpeners can save working hours, both at a time you will lose trying to work with a knife that is not on optimal sharpness, and at that time it will be needed to send it for sharpening – it's not a job that is difficult to do alone, and with a little practice you will save time and money you spend to get professionals to do it for you, or survive with tools that will not function as well as possible.