No, you know it's a good coin if it can be cornered. That is possible if only small amount of coins is issued in a short amout of time (the case of KEY) and all those that are volatile can be purchased for cheap and the price then substantially driven up. You can work on from there to repeat the cycle a few times. Historically the highest amount of a single stock sold by this method was about 1 billion USD worth. It works on the stock market as well as it works in the keys, the difference is that the stock market now has a watchdog and tons of regulation, while the crypto has none.

It thus attracts all kinds of adventurers, ready to explore or exploit the market.