That's true, I remembered acting in such manner where I bought an exchange coin and it dumped badly I had to sell off and since then learnt my lesson. To me I find it more entertaining getting involved with exchanges whose team are ready to work, bring up ideas, bring up features which will attract all manner of users, this is what makes an exchange coin valuable; such example is BNB. Therefore holding such coins, one is always closer to profit. Also in my own opinion, many people see the surge in price of Bitcoin as an opportunity to hold some of these coins (because an uptrend in the price of Bitcoin always draws other potential coins) which in turn makes them to increase in value as more are getting into it..