After reading this post it really reinstated my belief that most vendors aren't taking into account the risk:reward of selling.
The reason vendors keep vending is because they love the success and money they get. From a logical standpoint, these vendors don't need to do it anymore. They don't know when to quit.
Making 20k a month isn't worth the years in federal pound me in the ass prison. Once your in the darknet game it's hard to get out of it even when you can.
Smart vendors will have an exit goal, such as a set amount of profit.