There are still lots of Bitcoin users in the world who are not actually Bitcoin users, They deposit their Bitcoins with a third party and what they get in return are promises that they’ll get it back. That’s not really what Satoshi intended when he built a system that wasn’t supposed to have any middlemen.
Do you mean investing in HYIP sites? Well judging on the social media groups especially in facebook wherein scammers are everywhere and there are so many people who are still willing to invest in sites that will promise a return in a short period of time. I was once the same with those people investing in those sites but now I know better and I wanted to make people be aware that bitcoin is not just one of the investment schemes but it is a cryptocurrency created to get away with the control of the government. One of the biggest challenge for us is to make people be aware that those are just scam sites and stop them supporting and investing in it.