What a network Marketing or MLM Business model is, is the structure they use to help you Build your Business and make commissions, what training and Support that they provide to you (ours is Always Free), and how their pay structure is set up for example with SFI (the company I work with) has a total of 6 ways to earn commissions ( I currently earn from 5.) We have a set amount we can earn from the sale of any of our 88,000+ items that we have listed in our store, the more I sell the more I can make. as well as the more Active members I bring to SFI the more I earn too
It just depends on what company you are involved with some offer a better Business Model while others lack in this area. Me personally I love SFI and our Business Model they pay well and offer unlimited FREE Training forever (as long as you are a member of course)
Thanks for Asking and have a Great Weekend!