I think the risk and benefit of bitcoin are the same. When you invest huge amount of money, if you lost, you will lost your huge money. If you luck, you will get double even ten times of your invest amount. If you invest little amount of money, the risk also little, but the benefit also little from your invest amount. Sometime the benefit bigger than loss and sometime the contrary.
I spend a lot of time in bitcoin and according to my observations the risks and the benefits in bitcoin are not the same but the benefits of bitcoin are much more than the risks in bitcoin. It just require a logical calculation and estimation of the usage and time and community of bitcoin and the adoption of bitcoin with time then you will find that how much will it reach in value and how much time will it take to reach to a particular value. With that things in mind a person can estimate the timing of his investment and he will not find any risk in bitcoin.