Actually, bitcoin is made not for the purpose of investment only but as a digital currency that can be used as replacement of money or fiat, which is use to buy commodities and pay services. If everyone HODL, I think there'll be no price movement in the market. For me if its better to spend some of my holdings to keep the market going. If all bitcoin users would spend a part of their holdings, I think market price will continuously grow and everyone can enjoy its benefits and the good profits of their investments.