Because in their minds is that they can be more profitable if they bought coins that are at cheap prices. They are thinking that this coin will be in hypes someday and doubled their investment. But I'm not sure if this still works because, at this time, there are no such hypes happening in the crypto market.
It is true, that such a paradigm only applies when we are still in 2015, whereas now is no longer the time to have speculation or primitive belief that buying cheap coins will provide big profits in the future.
because the current growth of coins is like random and has no permanent pattern. in other words, many new coins have cheap prices, but in the end it didn't take long, died in the middle of the road and finished leaving investors with huge losses because they had already ripped off quite a large dollar.
so to save the paradigm there is only one way, namely focus on bitcoin holdings and you will be safe in the future.