Remember the famous quotation from Townsend Whelen? "Only accurate rifles are interesting." Same can be applied to knives: only sharp blades are interesting. (You can quote me on that.)
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A year ago, I went over to a friend's house for an afternoon of shared-tool gun tinkering. His detached garage is a dedicated workshop with punches and presses and belt sanders and stuff I didn't have. At one point, I heard a small electric motor whir, then the sound of finely grinding metal. Didn't think anything of it; kept doing what I was doing.
About a minute later I looked up and saw him moving a knife through an electric sharpener. I walked over; took a closer look. He was carefully pulling what looked to be a top-end Benchmade folder through a cut-rate sharpener designed for basic kitchen cutlery.
I asked him what he was doing...the exact terms used can't be quoted on the Forum.
Mind you, this is a guy who vehemently believes that, for a rifle intended for use at 200 yards or over, you should spend more on the glass than you do the rifle. I Googled one of his scopes and for months after, I kept seeing GoogleAds on sites presenting me with pictures of and links to $3,500+ Schmidt & Bender options.
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I respect edged tools; don't like ones of poor quality. You don't put a $99 scope on a $3,000 dollar rifle any more than you try to sharpen a beautiful Benchmade with a $19.95 electric one-size-fits all grinding stone disaster.
Even a modest rifle benefits from a good scope. Even the most modest blade benefits from a good sharpening system. After all, we've been scrutinizing and studying the sharpening of bronze, iron, and steel blades for a couple of millennia longer than we've been putting optics on rifles.
This is what I opted for: http://www.edgeproinc.com/, but other quality systems are out there.
If you have cheap kitchen knives and want them to at least saw through a hunk of prime rib with some effort, a cheap electric knife sharpener may do. If you have a piece of quality steel, it deserves the edge for which it was intended.