Duplication is a myth in the network marketing industry. Did you know that? Think about it. Not everyone is going to do it the exact same cookie cutter way nor can they. Even Jeff Olson someone who's made over 50 Million dollars in 15 years said it. Mark Yarnell said it as well. He only made $500 thousand a month himself. (I know it's hard not to argue with these two guys right?)
In typical business you want to have as many distribution channels as possible for your product or service to get it into the market place. So some distribution channels would be stores selling it from their store fronts and shelves. Some might do email campaigns and website marketing to market it. Another may do television advertising or radio advertisement. Some would do paper and print advertising. Then some are going to take a broad marketing approach to the massess and some are going to focus on specific nitches. The point is this. If you had a product or service and you had different distributors wanting to sell your services or products would you tell them who to sell it to and how? (Given it's legal and doesn't have anything to do with regulatory compliance. Let's use some common sense)
So in network marketing, again using some common sense, there are some regulatory compliance issues with certain products i'm sure. However if you have someone who has the ability the resources to do paper advertising for recruiting do you tell him or her no? NO. If you have someone that has ties to a certain industry and wants to focus on that through word of mouth do you tell them no? NO. If you have someone who has resources to a specific nitch do you tell them not to focus on it? NO. There is no one size fits all when it comes to the industry of NWM. There are "systems" however they are flexable. Big networkers know this. Allow someone to tap into their current resources THEN allow them and train them to branch into other markets.
Allow people to focus direct sales if they want. Allow people to focus on Recruiting if they want. Allow people to focus on both if they want. However keep the systems flexable and allow them to capitalize on their current nitches, then expand into other area's.