The degree of gamble involved depends on the games and levels one selects to play at, as well as the time frame under consideration. In the short term, be it a session, a week or even longer, variance often rears its head. Over the long term however, it doesn't take a huge +EV to make a living, especially when you factor in multi-tabling.
That said, not everyone has the psycho-emotional makeup to handle the ups and downs, which is a necessary quality to succeed. And I've seen a few people report that they quit because after a while, they just couldn't take the grind on a daily basis even though they were making enough to live on.
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