I use bitcoin here sometimes to pay our bills or to buy something online. I only use small amount so it won't be suspicious to authorities. I heard that the company of our local bitcoin wallet here ban or lock the funds of their user if they noticed some big amount of transactions. It's hard to prove to them that it came from a legal way because bitcoin trading is not that known yet here. You will need to provide many proofs to support your claims.
you can use bitcoin for payment and buying online? do you live in a country where bitcoin is legal?
because not all can allow this and in my country bitcoin can only be traded with money, not for payments or shopping