Earlier quoted context omitted.
I consistently meet people who earn > 200 $ / hour, without much programming experience (but know an open source project of interest very well). I see this quite a bit as well. People can "luck into" something that gets hot and ride that wave into decent money in the short term. But a decent programming background is what keeps that ship floating because you always have to stay on top of the next thing if you want to…
On the other hand, if you can pull in $200/hr consistently (i.e. your yearly income isn't far from $400k before taxes) for at least half a decade, you can save up enough to retire early with a modest standard of living. But as has been said, consistency is harder for these things. What open source projects have you seen people make good chunks of change from just knowing how to work them? http://www.pentaho.com/ is o…
For me, Magento (e-commerce) is the open source system that I lucked into. I got involved with it about 4 yeas ago which gives me a significant jump on the majority of devs I encounter. Besides being slightly ahead of the game, Magento has a reasonable learning curve that scares off a lot of the wordpress-eque devs and lots of more competent devs seem to thumb their nose at e-commerce, so the market isn't flooding.