Sometimes many people try to manipulate the market and buy precious tokens cheap and selling high later.They intentionally cause fear and panic in the inexperienced members and take advantage to perpetrate their greed activities.
The cryptocurrency market is different to any other financial market that we know. The early adopters of the cryptocurrency market are the cryptographers, nerds, computer scientists, wannabe entrepreneurs, etc... some would label them the 'outsiders' of society. These are the people that have reaped the rewards of entering the market early and becoming the next-generation millionaires. The nature of the cryptocurrency market structure allows the bad and greedy guys to get away with whatever they please. This sort of manipulation is going under-the-radar with many uneducated readers caving in to these misleading stories.
This is why I think that it has grown organically. The 'outsiders' saw an opportunity, believed in it, and dumped a bunch of money into it. Then they waited patiently and watched while other people came running too. That's as organic as it can get in terms of true growth of investment. Recognize a potential for growth before others do, and wait patiently until they all join in.
What kind of manipulation do you mean? In terms of ripping off unsuspecting traders, that does happen quite often in other markets too. Also, exchanges have been known to fake volume levels to make it look like more people are using their service than in reality (and therefore causing slippage).