It is a bad idea, and there is no good side to it at all.
Every hear of pyramid schemes? Network marketing is just pyramid schemes dressed up a little different so they can only just border on legal and do their business. When pyramid schemes were made illegal, the term network marketing was coined.
Network marketing, multi-level network marketing, and all other such terms are basically scams. You basically scam people in to thinking that buying cheap and poorly made stuff from you at a high price is a kin to a job, and that buying all this cheap shit that no one anywhere would ever want ever, will make you rich.
These so called businesses usually have a theme, so that they can try and convince you that they have something that is in high demand in one demographic or another, but if you give it any thought at all, you soon see no one will ever buy it.
I would offer anyone here the following challenge…
You start working for a multi level network company, and I will start collecting aluminium cans and bits of copper wire from old electrical stuff, and I bet you anything you like, that the first week you will earn more than me, by selling some junk to friends and family, but every week after that, I will show a profit and you will show a loss or no change.