system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does bitcoin fluctuate so heavily?

Like, the prices of this crazy thing that isn't real (because it can't be real when our money isn't real) is nuts. Plus, in 2 months it HALVES it's value? 

What kind've hyper inflation shit is going on?
gpt
Traditional currencies trade based on economic factors about the country they are tied to.  The factors to look for are well known and traders have a good idea how new data will affect the price.  This is why currency values are relatively stable.

Bitcoin's value is based almost entirely on speculation.  Speculative asserts are more volatile.

The same reason why a deck of playing cards will always cost you the same, but how much a friend wants for a Pokemon card can vary wildly.