No crap. $15? I have to imagine he spent at least a couple hours on it. Even $50 seems like it's not worth the time. I really doubt he's spending less than 2 hours on any of this. Not to mention just finding and applying...
You're correct. I did it more for the reviews, so that I can charge appropriate rates later on.
I spent probably 2-3 hours for that $15 (and 3 hours more for additional $30) and then about 2 hours for that $100 (expected $50). These are all excluding messaging, just actual work.
I'm sure the author took those low-budget projects to get at least some reviews. The rate gets better as you fill your profile and get good reviews, otherwise the customer will have to choose between 10 identical profiles (except that the names are different).