> Do you need to be an awesome photographer, do you have to be lucky?

No. You need a decent camera (as in a fairly expensive SLR model) and to know what people are looking for on Stock photo sites.

kreci seems pretty good at it - he's got a huge portfolio containing lots of very similar photo's (which is what you usually get) covering all the themes that are popular on stock photo sites.

If you want to do well his portfolio is good inspiration :)

There are people earning a lot more than this.