Some great choices here, and I would 2nd the votes for Spector, Lakland, Sadowsky and Ken Smith.
Why?
Because all of these brands offer a line of instruments ranging from entry or mid-level basses, all the way up to hand-made works of art. The high-end models will draw in the customers, and those who can't afford the top of the line models may be inclined to buy a lower level model of their preferred brand.
As a music store owner I'm sure you already know, affordable & entry level basses tend to be your bread & butter as far as sales go.
Why?
Because all of these brands offer a line of instruments ranging from entry or mid-level basses, all the way up to hand-made works of art. The high-end models will draw in the customers, and those who can't afford the top of the line models may be inclined to buy a lower level model of their preferred brand.
As a music store owner I'm sure you already know, affordable & entry level basses tend to be your bread & butter as far as sales go.