I remember seeing a comment by a local "celebrity chef" where he said he never sharpens cleavers - he just buys a specific inexpensive brand 5 at a time for $8 each and throws them away when they become dull.

While I don't agree with externalising the manufacture/disposal costs with that sort of disposable consumption, I do see the economically-rational decision making behind it.

If you're running a restaurant in Australia, your lowest paid kitchen staff get $24 an hour during weekdays, 30-35 and hour on weekends, and as much as $55 an hour on public holidays. And if they work more than 8 hours in a day it's 1.5 times those rates for the first 2 hours of overtime, and double those rates for anything more than 2 hours overtime. https://www.fairwork.gov.au/find-help-for/fast-food-restaura...

While spending 15 or 20 seconds honing the edge with a sharpening steel during use makes sense (and I'll bet he does that just out of reflex), once the edge gets damaged enough to need more that what a steel can fix and you start needing a whetstone, it's probably not cost effective to have kitchen staff spend time doing that.

If a dull knife takes whole 5 minutes to sharpen, it's 12 knives an hour. At $8 per knife, this is $96 per hour. Not worth it during deep overtime during a public holiday, otherwise...

I suppose someone less handsomely paid collects these disposed knives, sharpens them, and resells them on the side.