Con artists and marks (of various varieties).
The exchanges fake transactions, fake liquidity, then claim to have been hacked while they take off with your real money. (SFYL)
The middlemen pretend to use Bitcoin but are actually more like unregulated online payment processors (these exist mostly because Bitcoin itself doesn't work well and most users are clueless enough that pretending to use Bitcoin is good enough for them)
The 'whales' who actually have enough Bitcoin they can move the market around. They don't have to predict the market, they ARE the market, and by cycling the price they can milk cash out of a lot of idiots.
There's the enthusiasts who have just discovered the concept but haven't dug deep enough into to figure out why it doesn't work.
There are all sorts of political weirdos who think it'll survive as the currency that remains after the global economic system fails. Because after a complete global meltdown, there will still be a functioning, undivided Internet.
The greedy folk who think they can avoid taxes. Or predict the market and get rich (see 'whales' above as to why this would require a lot of luck).
It soars because people are stupid, selfish, self-deluding, and greedy. But it does not soar in a way that anyone not in at the top level of it will make any money on any real scale except by the wildest of luck.