Well bitcoins allows some people to make easy money working just with and at bitcoin world,just trading it along the day or week.People nowadays search for price and quality ,in fact the most now just search for the best price to make their shop.With bitcoin is almost the same,you choose when to enter and when to sell it,sure if you bought last year from 250 and now its near 500 you are willing to sell your coins.In the end bitcoin price will always act as the main reason some people use and get into bitcoin world,just trading it.