as most of the ppl here're saying,  it's all about fluctuations on the market and how volatile the crypto is. Totally depends on u dude, you sign in on an exchange service like Coinmarketcap or Bitwinex, buy a coin and then just wait until someone else buys it from you at twice the price or you wait till it goes to the moon n then you're a fat cat
I prefer the first one tho