Cash crop means profit, IMHO.

One of the most important lessons I learned is that what I like and what the custys like aren't usually the same.

A cash crop should:
-flower quickly
-have bag appeal (people like to brag to their friends)
-hit quick and powerful (not my preference)
-CLONE WELL

.....the list goes on....disease resistant, primarily Indica (for indoor)....
ETC