Might be our mentality of just holding it and just speculating that it will increase in price. Might be we experiencing a bubble just like Real State Bubble. Might we have got lot of uneducated investor who invested just in speculation without knowing in what they are investing and raising the price for the duration. Might be community at large become more interested in speculation game instead of building some service around it or contributing in some ideas or adding some value to the product .

Pick any one of the reason from above . People are really stupid in my eyes that are just holding without knowing exactly what they are holding.
Let, first get educate ourselves about cryptocurrencies before speculating the price