The reason why some people are still not interested in bitcoin, despite the huge potential earnings, is simply because of fear, due to the fact that the cryptocurrency cannot be regulated and it is not yet globally used for transactions.
As what I have observe there are lot people who's living is better because of Bitcoin but then there are still people not interested in Bitcoin maybe it's because they don't understand what really cryptocurrency is. And maybe they are afraid because of many negative issue which made by the crypto haters.