There are so many reasons why people are afraid investing in bitcoin. Even if they are planning to, they will carefully calculate the output and analyze the result of their investment. For me, one of the reason that they are afraid investing in bitcoin is that they still dont know more about bitcoin. Maybe they're still understanding or learning how to create a effective way of investing to bitcoin. Still they're afraid because they might failed in the future but keep in mind that if you are investing to something RISKS are always involve. For a certain time, investment is either failed or successful, up to you what approach you'll use.