I think because the crypto can't be touch like the real money, they won't invest on uncertainty and unpredictable thing. They also don't know how to invest on it because they still dont know technology. They won't to take high risk because invest in crypto is risky.
Many people think that electronic money is a scam, they hear that they do not want to be involved, so they give it a bad place, I think because they have not grasped the way electronic money works and They hear bad rumors about electronic money so they have a bad idea about this market. If they come in contact I think they will like electronic money. They have many advantages.
As long as they learn about blockchain technology, I believe they will believe in this market. and if possible they should introduce them to good ICO projects, their project development ideas. This will give them confidence.