Not true. For each buy that happens, there must be a sale. There are more buyers than sellers right now, not no sellers. Each time the price goes up, that's a sale _that happened_

This is something we've seen many times before. It's not new. It's a classic bubble where demand (buyers) greatly outstrips supply (sellers).

The big question is why. Crypto currencies haven't suddenly gotten more useful. The current rise is fueled by speculation of the ability to resell at a higher price.