If you really want to make money then find a decent job, or build your own business. Gambling can never be a source of income. The question is, how often do you gamble this year? Is there any fund which is intended only in gambling? Do you empty it and get on other funds? Do you quit when its time to quit? If you dont have discipline then most likely you will fail. 10 BTC is hige and its impossible that you didnt win with all that stuff.
I agree with you, gambling is a past time only. So dont think of that you will win always.We can say that its a source of income if you already an expert or a good gambler or you win in many times in everytime you gamble.