CD stores have the disadvantage of an expensive inventory, but digital bookshops would need no such thing: they could write copies at the time of sale on to memory sticks, and sell you one if you forgot your own. ↗
That has always seemed to me one of the stranger aspects of literary fame: you prove your competence as a writer and an inventor of stories, and then people clamour for you to make speeches and tell them what you think about the world. ↗
I was always a kid trying to make a buck. I borrowed a dollar from my dad, went to the penny candy store, bought a dollar's worth of candy, set up my booth, and sold candy for five cents apiece. Ate half my inventory, made $2.50, gave my dad back his dollar. ↗