Bitcoin is not a Ponzi scheme. Bitcoin is different because it was simply put there for people to use and it was almost free for people to take and use, like that well surrounded by a fence that allows only one person at a time in. You can wait in line or you can pay a guy in front of you to let you in so you can get some, but the water is always there and it's always free.  Bitcoin is rising in value because people want to use it and to use it they have to buy it from someone who had it before them. It's nothing like the Ponzi scheme because there's nobody in control, nobody taking all the profits and nobody able to shut the system down. It will keep going until the value stabilizes and you won't be able to sell your coins for more than you paid for them.