While I'm not a fan of BOID Inc, the original poster makes some odd claims.
1. They take your old vacuum and modify them to be worse? No, see, they go to your house, ask you to bring out your old vacuum, and have you demonstrate just how bad it is, then have you use the Kirby. If you do buy the latest and greatest Kirby, your old vacuum is recycled to thrift stores, currently the Marjorie Mason Center.
2. The Kirby vacuum doesn't work? They do demonstrations with potential customers using the vacuum, picking up dirt the old vacuum didn't, taking out stains, cleaning windows, etc to prove it does. The only thing that breaks or wears out (albeit infrequently) is the rubber belt, which is acknowledged upfront, and cheap to replace. From personal experience, my church has been using the same two Kirby vacuums since 1994, and they show no indication of needing replacement.
Now, the job does suck. It is commission only (anything they tell you about 1800/mo is a one month deal only). The only way you make money after that is by selling vacuums. And you aren't an employee, just an independent contractor; they have you fill out the appropriate tax forms. They make pretty clear that working with their team is totally optional and just a handy benefit for you.