Some questions to ask: What products do they have, and what separates these products from off-the-shelf products?
What are the incentives for people to buy?
What is their track record for reordering (This one is critical; if people don’t continue to reorder, then someone, or a lot of someones will have to be constantly putting new people into the pool of buyers). No one makes money unless someone, and a lot of someones, are buying the product.
Most of the legitimate companies who market person to person are simply shifiting costs. Getting a product on the shelf of a distributor - e.g. a grocery store or one like an appliance store - is extremely costly. Manufacturers actually have to pay the store a “shelving fee”, serious money, to get the product on the shelf. Then, to keep it there, they have to actually have the item sell. To do that, they have to spend money on local, regional and national advertising - any idea how many millions of dollars a 30 second commercial costs, say, during the Superbowl?
So the companies have spread the money out by paying people who help sell their product, or help others to sell the product.
Have you ever sold anything -subscriptions for school, candy for the boy/girl scouts, or worked in a store on commission? Can you go up to a perfect stranger and start a conversation with them? Can you teach others to do what you do? Can you learn from someone else and actually repeat what they do rather than re-invent the wheel?
If you can do those things, yes, you can make a living at it; and you can start slowly; but at some point, it will have to be your full time job.
If you don’t like sales, but the products are good, why not buy them and try them?