It is not that we are not expected to have raised expectations over making profits from bitcoin, but we only have to know the certain conditions involved in making bitcoin investment and we wont be disappointed with our investment.

You're right that some make losses and it can still be said that many are making profits also in bitcoin, it is expected of every investor to measures on what they can afford to loose, also, we cannot take bitcoin for a get rich quick scheme like the way other investments and ponzi appears, there are procedures and requirements need to go through in knowing the expected decision we must take before investing in bitcoin.