You know when I was little, I used to think that all the adults who fall for get-rich-quick-schemes are stupid. That they don't know something I do. Now I know it was in fact the other way around. I didn't know something, they did. And they knew: Sometimes these schemes work. They have seen people get rich quick, with no work. I didn't know it could work, I didn't see people get rich. So in summary I now know it is perfectly reasonable for people to think that get-rich-quick-schemes could work, because they can. (1% of the time, but they can)
The mistaken assumption underlying your statement is that people are interested in BTC to get rich.
I haven't seen that to be the case.
People are interested in BTC because they don't like economic systems that are designed to be meddled with to suit the whims of their controllers.
To me the value in a BTC is not in it's daily price (which only reflects aggregate userbase calculations of supply and demand both in the present and the future) but in the concept that it stands for.
There will always be speculators who don't bother to understand the nature of the commodity underpinning their investiment. The economic ecosystem that's developing takes all kinds to function. Attempts to regulate such characters away for percieved "unfair" activities, or to manipulate the market so that it "does what we want" are the sort of insanity that gave rise to a need for the BTC alternative in the first place.
Come for the promise of riches, but stay for the promise of liberty.