For the very same reason that Sherwin Williams doesn't offer half pint containers of paint. If you want to see what it's like, buy a quart.
Powder? A rifle powder quarter pound won't give any information.
A pistol powder? Sure, you could gather a realistic amount of information from a quarter pound, but with maybe 100 important brands,who has the room or capital? A quarter pound can would probably cost half as much as a pound.
Just keeping a good selection of small lot containers on hand could easily cost a few thousand dollars.
Powder? A rifle powder quarter pound won't give any information.
A pistol powder? Sure, you could gather a realistic amount of information from a quarter pound, but with maybe 100 important brands,who has the room or capital? A quarter pound can would probably cost half as much as a pound.
Just keeping a good selection of small lot containers on hand could easily cost a few thousand dollars.