Without a clue, no one can answer on this question if he does not deal with these matters or has experience in these areas. Weapon sales and drugs are handled by a small number of people and they make huge money its a fact, but risk there is too high if you dont understand what are you doing. With bitcoin works most people who dont even know and dont want to know about dirty money. I only know that you can earn more with bitcoins, but you will also have to invest huge amounts of money.