And at the workshop you'll be asking to pay for or buy something.
It's a scam. Ancient, inperson spam. Just tell him you're not interested.
If they can't answer questions or things sound too good to be true, they are. Eventually they will ask for some money.
They're not stupid either. They're just trolling for suckers. Someone falls for that stuff and that's why they keep doing it. If you start asking critical questions, they might go away too -- They'll recognize you're not falling for it.
It probably is a pyramid scheme. They're illegal (at least in the US) from what I understand, but I've heard they're still around an advertised on tv even.
If you have the time, sometimes it's fun to toy around with them. Just waste their time. Tell them you don't understand and have them repeat everything. When they ask for money, tell them you don't have any but maybe they could give you some to get you started?
I came back from work once and stupidly picked up the phone to be greeted by a phone service marketing guy. I was pretty brain dead and found I could half-concentrate on him. I asked him to repeat himself about five times. Eventually he actually asked if I was retarded and was I really the head of the household. I was actually concentrating on cooking at the time. I remember telling him other businesses had made lower offers. Just make up a lower number and give them the name of any business. I was surprised when he started saying "So that's a yes then? You want me to sign you up right?" That required actual attention so I hung up on him.
They can be fun to toy around with though. Just don't sign or verbally agree to anything.
Or tell them you're only there because someone from the Better Business Burearu is making you. Then see what they do.
Or tell them you're pretty sure they're paying you to attend and where's you're cash for that because they said cash. Or the other place gives you free food, etc. and why don't they?
Sad that it's someone you knew though. They must think you're a sucker then.