The vast majority of people arrested for dealing are the equivalent of grocery store clerks. (Really, their job has less prestige than grocery store clerks.)
People are making a lot of money off of this, but not, for the most part, anyone who is at risk of getting arrested and charged with decades in prison.
Furthermore, arresting them has about as much effect on the drug trade as locking up all the clerks in a grocery store. The demand is still there, the distribution networks are still there, all they're missing is people willing to work for minimum wage or less. (And obviously there's no shortage there either.)
People are making a lot of money off of this, but not, for the most part, anyone who is at risk of getting arrested and charged with decades in prison.
Furthermore, arresting them has about as much effect on the drug trade as locking up all the clerks in a grocery store. The demand is still there, the distribution networks are still there, all they're missing is people willing to work for minimum wage or less. (And obviously there's no shortage there either.)