People need to trade and exchange using Bitcoin so it can fulfill its initial purpose. Being this well accepted mean of exchange is what gives Bitcoin its value.

When you buy something with Bitcoin, you are kind of "selling", but you are using it for its purpose and making the whole ecosystem more valuable (creating the desirable circular economy). If everybody just buys and hodls, in the short term it might seem smarter but in the long run it might make the coins worthless.