S.B.
Lord knows I have many friends who have tried making money being "consultants" for companies like the ones you mention.
None of them have really been successful or continued with it long because you only have
A) So many friends
B) Those people only have so many friends
C) With the economy, few people have disposable income that affords them the ability to purchase things in this manner. People are looking for bargains, department store discounts, shopping on-line.
I'm not trying to be the bearer of bad tidings, I promise I'm not. Just be realistic about your expenses involved to get started and whether you are trying to sell something there is a true need for and that people can afford.
You can be the best networker, go-getter, marketer and sales person...but if people don't have money, you can do a lot of work for little return in these situations.
I certainly do wish you the very best in your endeavors. I am just offering my perspective and you may get lots of great replies to the contrary.
Good luck!