It's because no one truly knows where the market will head to in the next minutes that the SL (Stop Loss) is advised to be used. Trading is highly speculative. Some people even liken it to gambling (which it isn't, anyway). It's just that it also has the risk which gambling or any life business has. On what pushed price up, I will say it's FOMO. Nothing else. The fear of missing out creates the urgent demand for a certain project and you will see more people struggling to buy in without knowing why others are even buying in the first place. This scramble causes people to buy at whatever price that's available for them and price goes up more.