It's a little awkward, so we'll get straight to the point: This Thursday we humbly ask you to protect Wikipedia's independence. We depend on donations averaging about $16.36, but 99% of our readers don't give. If everyone reading this gave $3, we could keep Wikipedia thriving for years to come. The price of your Thursday coffee is all we need. When we made Wikipedia a non-profit, people warned us we'd regret it. But if Wikipedia became commercial, it would be a great loss to the world. Wikipedia is a place to learn, not a place for advertising. It unites all of us who love knowledge: contributors, readers and the donors who keep us thriving. The heart and soul of Wikipedia is a community of people working to bring you unlimited access to reliable, neutral information. Please take a minute to help us keep Wikipedia growing. Thank you.
Ponzi is a fraudulent method which works as a pyramid. In such schemes, profit is not made by successful economic investment, but by appealing to new investors and using their investment money to pay existing members. This is all very well and good while the system has a steady stream of new members investing into it but once a slow period is hit, the investments will stop coming in and the whole system will collapse. Sometimes the system organizers do not wait until this has happened and may just cease what they are doing and keep the money which had been invested. Often the investors do not become aware of this until they stop receiving their interest payments as promised.