From personal interactions with other hand loaders, they will purchase one pound of powder, sometimes two, but cringe at purchasing a larger quantity. Same goes for bullets and primers.
There doesn't seem to be any difference between casual shooters and serious shooters in general, concerning how many components they will have available.
I spoke with a fellow yesterday afternoon at the range.
He shoots 100+ rounds a week out of his rifles and more out of his handguns.
He never purchases more than two pounds of powder, a couple 100 ct projectiles and a couple 100 ct primers at any given time.
He shoots more than most, but has very limited knowledge on what he's shooting.
He keeps good records of his loads for each firearm and stays within the limits of the reloading manuals he has on hand.
He doesn't really grasp the parameters of different burn rates and just can't be bothered to get more informed.
Sooooo, he adamantly sticks to the recommendations in the manuals.
He's an excellent shot and has no problems with bullet drop calculations at lightspeed, just isn't interested in some of the other stuff.
He has a half dozen rifles that he loads for, given to him by his father and grandfather.
He's pretty upset with the constantly climbing prices on the components he likes and is completely reluctant to switch to another alternative.
He asked me if I would sell him a "pound" of H4831 and I refused. He of course wanted it at the five year old price it was purchased at.
I told him to go to the LGS and pick up a pound and I would trade him for it. He didn't take me up on the offer. I wonder why???