Trading is a lot better that mining. You just need patience and some reasearch and you can get yourself a mansion in a few years. Mining is too expensive for me and for a lot of people and I can only afford the electricity cost of using my computer.
I don't think so. Although you need invest a lot of money to buy device that use to mining but it's more stable than trading, especially if price of electricity in your country is cheap. Trading you need to spend much time to monitor the market, therewith you have to control your emotion before movement of the market if not you will give perverted decisions that will make loss your money.