Hmm... if I owned any bitcoin I guess i would sell at this point. I can not imagine it just rising like this for much longer, but honestly I do not understand

Hmm... if I owned any bitcoin I guess i would sell at this point. I can not imagine it just rising like this for much longer, but honestly I do not understand the dynamics of why this is happening so I am just defaulting to "what goes up must come down" type reasoning. Random non-technical people I know are just getting into the cryptomarket this week and last as they have heard it is a good must win investment. But is that really driving up the prices?