Comment by DanBC

People are addicts. They don't have cash. They get cash by burgling houses; mugging people; shoplifting tide (and other products); or prostitution.

Getting cash by shoplifting has advantages over burglary, mugging, and prostitution.

People selling crack are criminals. They have some organisation and are usually involved in other crime. Once you have the network and are committing crime selling Tide is just more profit.