Directly out of college and needing money, I was almost talked into selling vacuum cleaners. Might have fallen for it too if I hadn't answered an interview for an "advertising" job from found in the Chicago Tribune want-ads that ended up being nothing more than a Ponzi scheme. What's worse is these clowns were pretending to be affiliated with DARE, had the nametags and everything (they were selling coupon sheets to well-to-do families off of Algonquin Road in the northwest suburbs, and it was obvious that they were phonies if you read the fine print - DARE was only getting 10-25% of the money collected). I tagged along with this guy who went up and down every street in several neighborhoods selling these coupons. Of course, they had me look at the boss' Lexus coupe before we left, and kept reminding me of that the entire day (little did they know that was hardly a motivating factor for me). The final straw was the power play they put me on when it was late, I had sore feet, and was very tired - "You can either go back to Iowa (making it sound as shameful as possible), or you can come upstairs and get signed up." Needless to say I for all purposes peeled out of their parking lot as I couldn't get away from there fast enough. One of the worst experiences of my life.
Now, while Kirby is a legit product, I wasn't going to get suckered into something similar, as it also is for all purposes a Ponzi scheme, just centered around a legitimate product.