My logic is, if you can make 12 btc through trading, why you still need to open other bussiness? Just stick with your trading strategy and keep improve your skills rather than open another bussiness which you can't make sure you can make profit from that
trade there's risk to loss preview profits, not bad idea to open another bussiness for an extra income
The idea is that business brings also risks and troubles. And losses. It is interesting as well to realize yourself in it and get extra profit, but trading gives you more freedom and absence of some not very pleasant moments typical of business, spesifically at the first its stages
Anyway, I support the idea of extra income in case of black swans... that's why have an "emergency exit" to other area to work at