I'm not entirely sure why the boundary is there, but I'm sure there's a reason. I'm here to simply give my reasons why it shouldn't be quite as high as it is. At the current moment, only druggies ranked Chemist or higher may post drugs for mules to take. Most of these players likely have a reliable way to get past the cops and therefore have no need to lose that cut, and those who do post jobs are few and far between. If the required rank was lower, there would be more jobs coming from more people, which allows for more mules. It also allows newer players to skip the hardship of learning the routes, and they can learn to run their own drugs when they feel they would like the full cut - and possibly make side money as a mule. Thanks for your time!