How many votes does a Super Delegate Respresent?

Whatever happened to one person one vote? This doctrine isn't confirmed in the voting policies of the Democratic party and therefore it is not true for the United States. The parties are the gatekeepers to the government and we are seeing first hand how the Democratic and Republican parties mock this concept.

There are 719 total Super Delegates for the Democratic party. We can divide the total population of the party or just the population of the people who voted by 719 and get an idea of how many votes a SuperDelegate represent.  I am not sure how many voters there are in the party, before the purge. There are  247 popularly decided Delegates for New York's 1.8 million Democratic voters, so each delegate represents 7300 voters in a contest. Roughly 1/5th of the Delegates are Super Delegates. The elected delegates for New York are  44 Super Delegates for New York. All total the 44 SuperDelegates equal 322,000 voters.

If a Super Delegate is counted at the convention like a regular delegate then that means that a Super Delegate from New York represents 7,300 voter in one vote; without debate and by their independent proclamation as a Super Delegates. No accountability, No democractic responsibility.

The effect of the Super Delegate is exponentially powerful in that they have been counted against Bernie Sanders throughout the election process or whenever Bernie has pulled within striking distance of Hillary Clinton in order to defuse support by making the public think he can't win. In this way I would extrapolate that the 700 delegates represent about 280,000 actual votes and have therefore swayed the Democratic primary as a whole. This process has allowed the potential votes of 719 people to decide the next Presidential contender for the United States, a hardly democratic process.

At what point is the process by which parties choose candidates subject to legal review and control. Should not a party be held to a one vote per person rule in order to legitimately and democratically elect a President?