People don't want to buy legal drugs from their UPS guy.
EDIT: i'm from outside the US, and after reading all the complains about delivery people throwing packages etc, i thought people don't trust delivery guys enough for medicine.
In many cases, insurance mandates that you use their contracted mail-order pharmacy when possible. In other cases, they recommend but don't require it since the fees are lower for everyone that way. This is in the USA.
My partner buys legal drugs from her pharmacy. Half the friggin time, there's some supply problem on the back-end, and she can't get her drugs in time.
Anyone who could fix this problem will get her business in a heartbeat.
EDIT: i'm from outside the US, and after reading all the complains about delivery people throwing packages etc, i thought people don't trust delivery guys enough for medicine.
It appears i was wrong.