profit is is the answer.when you tell a newbie about the price of bitcoin he will be amazed.because it is a good way to earn money.when some one come to know about the easy way to get profit he will be interested.another thing can make them interested that is the decentralization system.no one can track your transaction,you are free to use it.these two things make a newbie interested in bitcoin. it is my own opinion, there are some other things that can attract people and these things depend individual choice.