Where does the main man siphon off his money if it's all peer to peer?
It's peer to peer via conversion into Mavros, MMM's centralized tokens/coin, the exchange rate for which is determined by the admin.
http://mmmglobal.biz/faq/Mavro is a conventional unit for measurement of participant's contribution in MMM. For instance, if a participant has granted $100, he receives 100 mavro-dollars. Possible Mavro’s growth rate is 30% per month. The amount of mavros in the participant’s PO shows the maximum amount of assistance he can ask for. For example, if the participant has 100 mavro-dollars, he can ask for $100 assistance. The number of growing mavros and progressive calculation of the amount of help can be seen directly in your PO in the section “Mavro”. Attention! Mavro is not a currency, it is not any kind of debt obligation or other form of financial assets. With mavros, you can’t buy any goods or services.
At any time the number of mavros, rate of growth and the types of mutual-aid programs can be changed in the interest of the stability of the Community in order that participants continued to get help.