I am not anywhere near as experienced at making or selling pens as many others here are, but here's my little bit of experience. There was never thought of selling pens when I got started, but they piled up pretty fast and so did the cost of making them. I still consider it a hobby and just want it to be self supporting going forward. So far that's been working.
I started selling on Etsy, because it's easy and has a lot of traffic. The fees do eat into the bottom line some, but I can live with that for the convenience. As of 10/13, it will be 1 year since I opened the store. I have no intention on making a living from selling pens (or any hobby/craft items), but I also don't want to be known as a place to get cheap pens.
That being said, I do have very basic slimlines and similar Cross style pens at $26, my lowest price for now and I'm not planning on doing anything for less. The pens that I have sold the most of are more expensive, in the $45-55 range and I'm working at making that my lower price range as I progress. They are more unique, even if it is just a couple basic straight cut segments with a soda can glued between them. As has been stated, people want something different and even my short time selling has shown me that is an accurate assessment. The cost of materials was pretty much the same for me on the higher priced ones, sometimes even less using cut-offs and such, but it took me longer, so I charge more. To me, it makes sense to match your pricing to your skill level, giving yourself a "raise" per hour as your work improves. When I get to the point where I am able to do some nicer segmenting and more elaborate designs, spending multiple hours just creating the blank, let alone carving and finishing it, I will definitely charge a lot more for them. Artisans would not price pens for hundreds, or even thousands, of dollars if people were not buying them at that price.