You aren't limited to doubters here. This is in a class called voltage multipliers. They're common in oscilloscopes, especially when encapsulated in the the form of the PDA multiplier. By adding more sections onto the basic doubled, yo u can have a voltage tripled, quadrupled, quadrupled, decoupled or more. I've made decoupled that would light a neon lamp when driven by the output of a 555 timer. As a family, they aren't expected to deliver a lot of current since they operate on the ability of the caps to hold a charge. The bigger the caps, the higher the current capability of the driving across supply, the heavier the load it will support.