I Have never seeing anyone who said, I made huge amount of money from trading bitcoin, the testimonies I always see or hear is see the amount of money I made from my bitcoin investment.
Don't be so capsulated by wrong impressions concerning trading bitcoin, I will tell you this frankly that bitcoin trading is the best ever to enjoy doing, because you're rest assured of getting to the close result of what you have speculated for , unlike other altcoins that you don't know their bearings, the more you trade the higher their risk, they only promise high returns, but we would have forgotten about the high risk involved also, try and trade anything without the knowledge of doing it, you will definitely fail, same applies to those that think bitcoin trading it not profitable, it's either they are inexperienced or they are running after making quick money from trading altcoins.