Gambling ....

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gambling and earning are two entirely separate things; earning is generally risk free, while gambling is a simple game of chance. i dont know why people tend to think of gambling as some sort of source for income, but unless you are a professional poker player, gambling is not earning by any means.
I was actually going to bring up the poker analogy. There is some grey area between games that are purely chance and those that are partially or majority skill. I would consider poker to be a game of skill no matter whether or not you are a professional. I eeked out 5-figure/year earnings from Full Tilt before Black Friday in 2011 for a couple years and I wouldn't have considered myself a "pro."