The ones you really want to stay away from are the ones where the product being sold is secondary to other buy-in or membership costs. I remember someone trying to sell me on one of these sorts of schemes, and it was like pay $100/month to be a member, which entitled you to order stuff and sell it. But the catalog info was vague as hell, and it was clear that the real intent was to get people to sign up more people, with each getting a piece of the membership cost of those they brought in. The products for sale were so obviously just an afterthought in order to make it technically legal that it was laughable. Always a bad sign...
Male enhancement products? I'm trying to game out what someone thought you would be a gullible sucker about. No, wait, sorry, I phrased that poorly. I'm trying to game out what someone thought you would be a gullible sucker about that you aren't a gullible sucker about.