In relation to these numbers and my earlier post, 39$ and 31$ RPI makes more sense - if you spend an average 1 hour on the photo, you'll have made around 31$ per hour (this increases as you go thorugh the years, of course, and in 3 years if all stays the same you can say you earned 90$ on that same hour of work). 31$ seems nice.
2$ Yearly RPI, which seems to be the reported average at some microstock forums/blogs, is not very reasonable. You'd have to wait 10 years to be able to say that you made 20$/hour that whole time... Even if you add a few agencies and say you have a 6$ RPI yearly, that seems rather low when you consider the hours put in. (or am I making a mistake somewhere?)
? I'm just trying to educate myself, apologies if I'm making an astronomical mistake.