It depends on why I'm buying the fabric.
If the color or fabric is 'perfect' for a quilt I am planning or a fabric that I need another yard of to finish a quilt, I pay whatever the price is.
I'm willing to pay a bit more for 10" inch squares than for charm packs because I have the flexibility to use them as is or cut them any way i want.
If it's fabric that I want to use for binding - like a jelly roll of all one color - black or navy blue or red, for example -I'll pay the asking price for a jelly roll of 20 or 40 strips. They last a long time, so that's not a huge expenditure.
Hope that helps, and good luck in your new business.