Why do people invest so much?

People need money ,so when they hear that something can get you money they do it
I myself invested money on btc 1 year ago at first it was not an investment i just wanted to buy 1 bitcoin for fun to show to my friend that had a bitcoin at school then the bitcoin growed so fast i kept it it maked me happy that i got 10k from 1k . Btw I think most people think that invest right now are retard ?

They ve should of listen the media 3 year ago when say said "Bitcoin the futere of money"