You can beat that moneyed system if you happen to be an eccentric billionaire, who happens to have been a household name for decades, who will say anything, racist, misogynistic, hateful, lies and false promises, to get the exposure to get elected despite not paying for it.
Just about anything else and you need money to get exposure, get on television, get yourself in the spotlight. He just didn't happen to have needed money to get exposure, but that's an exception, in exceptional circumstances, and limits potential candidates to those with exceptional media/wealth backgrounds. That's not a model that makes sense to sustain.
And there is a reason for that: "Hillary Clinton was the candidate of the military industrial complex and international finance capital."[1]
[0] https://www.opensecrets.org/pres16 [1] http://www.counterpunch.org/2016/11/09/the-rejection-of-wall...
Promising to never accept special interest money, only to go on to actively seek out and take it a mere months later, proves that it's necessary to win in an election.
So in my opinion he hasn't demonstrated anything useful.