Are you opening a bookstore that takes bitcoin, by chance? If you do, I'll be there so fast the virtual door will be off its hinges. 
Here's some of what I like/buy:
* Economics
* Espionage thrillers (fiction, like Le Carre)
* Fantasy (fiction, especially non-standard fantasy, *not* EFP) (EFP="extruded fantasy product", meaning bad Tolkien clones, etc.)
* History (non-fiction, especially U.S., Americas, Arabian countries, Russia, sub-Saharan East Africa, China)
* Magical Realism (fiction, Latin American, in Spanish is best)
* Mystery (fiction, like Conan Doyle, Dorothy Sayers, Elizabeth Peters, not so much hard-edged stuff)
* Political thrillers (fiction, like Ken Follett, Fletcher Knebel, or the early Tom Clancy)
* Political Science (non-fiction)
* Science (non-fiction, both technical and for the lay audience)
* Science Fiction (All kinds, esp. Russian SF in Russian)
This list is suggestions only, however. I buy and read all sorts of books if they catch my eye.
Here's some of what I like/buy:
* Economics
* Espionage thrillers (fiction, like Le Carre)
* Fantasy (fiction, especially non-standard fantasy, *not* EFP) (EFP="extruded fantasy product", meaning bad Tolkien clones, etc.)
* History (non-fiction, especially U.S., Americas, Arabian countries, Russia, sub-Saharan East Africa, China)
* Magical Realism (fiction, Latin American, in Spanish is best)
* Mystery (fiction, like Conan Doyle, Dorothy Sayers, Elizabeth Peters, not so much hard-edged stuff)
* Political thrillers (fiction, like Ken Follett, Fletcher Knebel, or the early Tom Clancy)
* Political Science (non-fiction)
* Science (non-fiction, both technical and for the lay audience)
* Science Fiction (All kinds, esp. Russian SF in Russian)
This list is suggestions only, however. I buy and read all sorts of books if they catch my eye.