Do we all want Bitcoin to be a payment system? Do we want a future based on Bitcoin and decentralization? Do we want bitcoin to succeed? Why then do all the biggest Bitcoiners wait for a certain price to sell. Someone goes to a press conference and says that he is a bitcoiner and will not sell at a lower price of 100k or 500k or 1 million. If you want a bitcoin world, a bitcoin future and a payment system, why sell bitcoin at any price? And that's what people say at bitcoin press conferences
People sell bitcoin because people are using bitcoin mainly for trading. If you compare how many people are using bitcoin for payment, you will find the number very less as compare to the number of people using bitcoin from trading and speculation activities. People still consider taking profit in dollars and hence they cash out when they feel they are in profit.