Bitcoin is getting expensive or shall i say it is gaining its real value because of growing worldwide popularity,acceptance as well as its own characterstics/advantages.
The prices are expected to be rising in future as well because market sentiments are positive.
Bitcoin demand is going high and when demand go high so then its price also go high so thats why bitcoin is so expansive and Im sure that next year its price will go more high because more companies and countries are waiting for bitcoin and when they join bitcoin so its price will go more high than ever and every one they are wishing that its price go more high because bitcoin is they only currency which can help people around the world.