Ahh! A question relating to money. I like this.
First of all, Shifty and I have found that, if you use the right techniques, it is possible to make profit beyond your wildest dreams, no matter what the business venture...without even "technically" charging your members! Even better, you can...mislead is not the right word...your clients into believing they are recieving your services for free!
For instance, when Shifty and I wanted to..say...own a country...we developed a technique that many referred to as "Mass Brainwashing." We preferred to call it "Agressive Suggestion." By the end of our program, the citizens of Chad worshipped us as Gods! What a hoot that was.
However, in your particular situation, I believe we could scale down plans. I like the idea of a "Training Camp" best, because the title is vague, and paramilitary sounding. Taking away the rights of your clients by having them sign a contract that effectively retracts their civillian status is a PLUS!
I've always liked the idea of protection money. But, many first timers are nervous when it comes to addressing their first vict...clients. I suggest starting out nice and easy.
"It's pretty dark out here, and there's nobody else about. It's probably a good idea if you give me your money to hold on to. You know...for protection."
This is especially effective if followed by some sort of reassuring gesture, such as pounding your first into your hand.
Don't worry, by the time you're finished, all you'll have to do is glance in their direction, and they'll be turning out their pockets for their last bits of change! People are always happy to please!
The great thing about this plan is that it involves a minimal upstart...heck, all you need is an enclosed space (Privacy and Seclusion is ESSENTIAL) and a sign. (Perhaps a few "Instruments of Incentive" too, but that's for another day, hoohoo!")
I hope this helps.