Why it is that Bitcoin is not accepted in our country (Nigeria)?
WHat do you mean by not accepted? Is it not accepted by the merchants or has been blocked by the government? If it is about the merchants, then chill! That is not available in most of the countries so the people are using it as an investment asset instead of purchasing currency. However, if it is by the government, then you have to understand that your government don't want their people to stand financially.
Even in my country, the legal status of bitcoin is not clear. The government never issued any notice to the users nor legalized it. So I am mainly using it as a trading tool and as an investment asset. Whatever I cash out through out the years, I always include it in to my tax filing just to be safe.