Yes you are right, many users do that like they use their money to buy bitcoin and the bitcoin they buy will used them as investment. Maybe it is a good approach since bitcoin value now is increasingly, and that's a good thing in your bitcoin if you done some investments. But there's also negative result if you invest your bitcoin when the price is low or fall down at the bottom. Well if i have enough money to buy bitcoins, i will take a risk to do that.