There is some problem with bitcoin. First is not all markets recognize bitcoin, second is that it is hard to earn because sometimes by not meeting face to face with the seller you may get scammed, and it is always happening.
well that's because of a small adoption at the moment, but in the future I'm pretty sure that as the price rises and as more and more people will be using bitcoins, more markets will be allowing people to use it as a payment method, everything comes with time and it will happen sooner or later, there's nothing wrong with the bitcoin at the moment.