To explain it a step further... at this moment in time, every private and institutional investors stopped selling APPL...I can still buy a share, likely thousands of them... from the market participants that are always there: market makers. When you make a "bad call"(like selling into a rally), a market maker is likely on the other end of your trade, and they will profit from your "bad call". Now the inverse also applies, often times a market maker is taking the other end of your trade that is a good(profitable) trade for you. The market maker isn't losing though, they are just playing the odds. They are convicted that for every losing trade they take out of obligation(as a market maker), they are going to take 2 or more winning trades. They also operate with trade costs much lower than you or I(ie retail investors) have access to.
That was more reply than I originally intended to write...but you have to understand this(or fail at profitable trading). There is no equilibrium, and there are parties(market makers) ensuring that there never will be. That is their job, to create a state of constant liquidity, even if buyers and/or sellers individually are unwilling to play.