This will change in a few years (or maybe sooner) when the adoption phase kicks in, but for now, to the average joe and most of the btc users, holding coins just to increase your chances of getting profits once the market starts a bullish trend outweighs the need of wanting to spend coins to purchase stuff.

Things will change once there's a solid regulatory framework in place (and also once the lightning network goes mainstream) that can encourage more merchants to start accepting bitcoin and other cryptos as payment, and this will encourage people to spend their btc .