Trading is not only a single place to invest your money you can invest your money in real world too where the chances of making profits are better in compare to online world and those who are not aware of how trading works will never prefer to invest their bitcoins into it and will find for some safer investments.
The only safe investment everyone has is the one where they have a lot of knowledge. Example, someone who has a good enough knowledge about computers can open up his own computer rental shop and be able to troubleshoot it by himself. He also knows what to do with the computer if it gets virus. But there are also investors that simply let other people use their money for capital and then get a share of the profit. The investor don't have to learn about the whole business but rather just have to see if the business plan is qualified and if the business has a potential to earn.