For most Americans, they will eventually use their normal brand of flour, so buying extra is essentially no extra cost. (Time-value of money over, say, 6 months means that we're talking about a 1% difference here.) It's a cheap hedge against supply disruptions. But that's not very likely to happen. The organic brand is often at least 20% more expensive, making the calculus not worthwhile.
Put another way, if you expect flour prices to rise 10%, you should buy as much flour as you will use before it goes bad at today's prices, and 0 organic flour at a 20% premium.
Knowingly putting pesticides in your body never seems rational to me, even if it saves some money. But if they were going to do that anyway, then sure, your point stands.
Three weeks ago, there was no flour of any sort in the store I went to. No corn meal, not grains at all. Except for matzo meal, however, on the end of aisles where seasonal products are held, so I finally made matzo ball soup for the first time! There were also no beans except for a completely ridiculous $8/pound of dried lentil in some sort of super fancy packaging.
My experience with commercial toilet paper has been the same, watching it dry up just like retail. People seem to be stockpiling cheap familiar essentials, plain and simple, wherever they can get it.
That said...
>People seem to be stockpiling cheap familiar essentials, plain and simple, wherever they can get it.
I'm sure there's some truth to this. I'm not stocking up on huge quantities of things I don't need. But, for example, a couple weeks ago there happened to be one bag of my favored flour in the store so I grabbed it even though I wasn't necessarily at the point where I would normally buy it. I also have an extra dozen eggs at home. Etc.
Multiply that behavior by most people and that's a lot of extra buying from stores and inventory scattered around everyone's houses even though most people aren't doing the two-year supply of beans level of prepping.
The only way I have been able to get any since this started is the store I mentioned elsewhere that is selling individual institutional rolls.
About 3 weeks ago I went to Walmart at 6AM to beat the crowds. I got meat (20lb tube of ground beef!), rice, flour, and a bunch of essentials. Checked the toilet paper aisle and they were out.
Went back to my car and while I sitting there, I saw people leaving the store with TP. Asked a lady where she got it and went back inside. It was gone!
Between the time I checked the racks and left the store (maybe ten minutes at most), they put out toilet paper and sold out! That's insane.