It's not really greedy people. You need to understand that the price is actually what PEOPLE are willing to buy BTC for.

The reason it hasnt reached 100k yet is because the use case is not as much but its like a self fulfilling prophecy. The more people who want higher prices, the more they buy at current prices, the more current prices go up based on simple demand and supply. And as a result the more applications and attention BTC gets, thereby bringing in new waves of people at every iteration of the positive feedback loop.

It's not about greed as much as how people think. Right now BTC is not even touching mass market investment. Once the 13% starts buying BTC like its no tomorrow. We will see the true price changes and even then they are not buying for greed as much as buying into the money of the future.