Who are know the actual reason of bitcoin price? How can i predict about bitcoin pricing high or low?
No one can predict the price hike of bitcoin. There are many factors affecting the pricing of bitcoin. 100% chance of success to get profit from it is impossible.
to be honest you are right, people just are unable to guess it usually, though what you could do is just invest into bitcoins for a long term and then wait for like 5 years or something. In this way you might become even a rich person just by doing nothing. For right now I think the price is increasing purely for speculation in China and stuff, so I would be really careful about investing right now.