I agree that pens can be good money... as long as you keep away from ("distorted") slimlines and pick your clients/marketplace carefully. There are a few people that are prepared to part with their shekels for quality products... a finely crafted pen/rollerball (not ballpoint... there is a big difference) will always attract discerning customers.
Loved your celtic knot... and fully appreciate the effort put into it... however, most customers could not appreciate the effort and cost (time) involved. I bought a Beall Pen wizard years ago thinking to revolutionaise the pen industry and woo sophisticated customers... sold 3 pens designed on it, and gave away the rest (4)... it is now object of my box making blogs.
If your first cut is too short... Take the second cut from the longer end... LBD