My biggestw problems with Bitcoin is that I never have enough of it. 
Seriously, the biggest problem are sudden and big ups and downs in the price, although that is not the case at the moment because it's pretty much stable
Seriously, the biggest problem are sudden and big ups and downs in the price, although that is not the case at the moment because it's pretty much stableLolz, that's the problem with majority of us then we don't have enough bitcoins, and we are trying to earn in the best possible way at a moment as we know that the price would be much higher in future.