I experimented early on with setting some different prices. Given the low volume of sales at that time (don't hesitate to help me out with that, good people!) the experiments didn't really yield any actionable results.

So now I just copy what other people are doing! Can't set the price too high since I'm still brand new to most people and there isn't that level of trust in my writing. But can't set it too low, because you must respect the value of your work. Too low a price and readers will think you don't value your own writing, so why should they?

I sort of agree with you. Early on, I was setting the minimal price ($2.99 for the e-books and the minimal POD price based on the number of pages. Sales didn't exactly explode. I hypothesize that a minimal price signals to the reader that an e-book is "cheap" and not worth the money. I also feel that a double digit price is too expensive for a trade paperback. Of course, I recall "pocket books" for 35 cents and trade paperbacks for five dollars or so. Just as I recall when a cup of coffee cost a dime, and there were public telephones that charge ten cents per call.
So, other, more experienced writers out there: What do you folks think?