Upselling: By having a cheaper product, and top shelf product you can offer the lower end product for standard price and offer the nicer stuff for more, this creates a customer surplus. You can learn more about customer surplus in this episode of freakonomics http://freakonomics.com/podcast/uber-economists-dream/
If you have a new customer don't always tell them you have the drug. If you say you can get it from your buddy who just happens to be at your house you can charge a higher price even if this customer is your friend as there is no trying to get a better price, you simply say i can't control the price it's his.
Distributing vs Selling. Be careful out there. Selling comes with a greater risk even if the penalty is less severe. If you can manage to get people under you selling for you, not only is risk mitigated but there is more profit to be made.
Customer Service: As with any business Customer sevice is key. Be ahead of time and always avaliable. Never short and make sure the scale is +.01 over at least. This will have your customers talking among themselves about how highky you are regarded. If multiple people in the same friendgroup by from you, and they are having someone else over, if 2 are talking highly of you the third will want to buy from you if nothing but for a sense of belonging.
Feel free to add more, what business/economics lessons do you apply to your business?
compare cock sizes right away so we know who really is the boss.