Obviously the quality of your work and pricing is key ... I've seen your work which is very good so as long as its priced right, im sure you'll sell well enough.
As soon as I get the chance I will make some assets and see how they go, however I am a little short of time at this very moment. I am a full time graphic designer and animator and I am no stranger to 2am deadlines, also I am hoping to be working on a game in my spare time very soon.
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I don't know exactly how much others make, but i can imagine some make more.
At first i thought "Wow, you need $100 worth of sales to get paid" but i then saw that sales are good and i have been paid many times.