>>7206529real money and stakes takes a toll on one's rationality over time if not careful.
investments also aren't as transparent as these coins on information, even in retrospect you wouldn't have information on why something pumped/dumped for example.
If you believe these boards are influential, which they are to varying extents depending on the topic, there's actual incentive to FUD hashly and schizopost.
all this with the fact that there are anons throwing their life savings into memes...