I think you should. Most people I've talked to say its way too low prices, but I suppose that in "art" scene. I have always found it hard to see monetary value in industrial artworks, I often give them away to friends and contacts. It's the first time I've had a sale outside my exhibitions, these are the prices I chose. Based on amount of time and hard work laid down into the pieces + personal liking. Selling in order to raise funds for a vinyl release I'm doing. I wish I had more time to do art on regular basis but my schedule is so fucking tight these days....
The "Ghoulson" book on Autarkeia has been ready for almost a year, but printing is taking forever. It should be out before end of 2012.