Fishing on 5 at once, would be an interesting short video on the power of mouse broadcasting and boxing in general.

But its probably not worth the time and effort, compared to what we can do as boxers. Plus as a commodity, the more we farm it, the less valuable each item becomes. With dailies, it is purely gold rewards from the npc's. And with cooldown items, you're less likely to impact the market negatively with 20 or 50 items per day, compared to say 5000 fish per day.