IMHO, you can't go wrong with Etsy. I sell a lot of pen blanks and pens on Etsy, but I also have an independent website that does almost as well. My asking prices are worth the work I put into them!
Most folks who sell pens on Etsy slit their own throats by under-selling themselves. Ask what your pen is really worth. Add in your time, the cost of the kit and blank materials as well as the time it takes you to maintain your store. Some Etsy pen sellers do, but most don't.
The day I started charging more for my work is the day I started selling more pens than I could barely keep up with! I believe the perception among Etsy buyers out there is; Cheap price = a cheap, crappy pen. Moderate price = a moderate decent pen. Expensive price = a top of the line, well made, excellent pen. The choice is yours.
Folks who shop on Etsy are looking for unique, one of a kind, high quality hand made items. For the most part, they have no qualms about spending money on good stuff! Your pricing structure should reflect your pride in your work!
... Just my .02¢ worth