There is a huge variation in the price of pot, depending on the type of pot (again, a large variation), where you are, what time of year it is, and who you are

There is a huge variation in the price of pot, depending on the type of pot (again, a large variation), where you are, what time of year it is, and who you are buying it from. What the $10 is referring to are the bags you can buy on street corners in some cities. It is the same with crack and heroin, a standard and simple price, with standard terminology (a bag, a dime, etc.) all to make the street-based transaction easier and less conspicuous. It has no bearing on the real value of pot, which can vary from a few dollars a gram through to $50+ a gram. What changes is the type and amount of pot you get in a $10 bag.