The people are thinking everyone can get huge profit, but mostly they will lose all.
That is one point in why people are addicted with gambling but the most common of it is being depressed and needs to have something he would release his feelings with and that is gambling, another thing is the lack of social life and no friends at all.
I would never tell friends that I gamble, gambling is far from being accepted in society, so I would keep it secret, same goes for BTC, I don't think it's a good idea to go around telling fiends you own Bitcoin, because in 10 years when you are rich you don't want people to know that, beyond your close family if anything.