Photography is a hobby of mine, and I have no plans or desires to do photography professionally or full time. But I have noticed that it's a particularly expensive hobby, so I wouldn't be against making a little money, if only to afford the gear. I've looked around
iStockphoto a little bit, and it seems this might be an easy way to generate a small revenue stream. (By easy, I don't mean that my photos will necessarily sell quickly or raise a lot of money. I mean it won't take much effort to leave photos there to sell. I won't have to do things like market myself or seek out clients/projects.)
Does anybody here make use of iStockphoto? If you don't mind sharing the information, how much might a casual photographer hope to make? Are there similar sites I should be considering? Am I misunderstanding the amount of involvement that would be required?
I'm a little curious to see that there hasn't been much discussion about this. I know there are a lot of enthusiast and hobbyist photographers here. I would have thought this would be a group looking to support their habits (er...I mean, hobbies

) with a low-effort stream of income. (Perhaps this just means I'm wrong about the effort involved.)