My problem in bitcoin is the transaction fee, it's because the price of it is very high. Your profit in bounty campaigns will be deducted by that transaction fee. The transaction of bitcoin was too much. I hope soon it will decrease, decrease until it won't take a quarter on your profit. And also one of my problem in bitcoin is when the price is low. It takes long time to regain it's high price in the market. But we also need to be patient. what comes easy wont last.