I understand what you're saying. I have ebonite pens from India that cost $12, the Conklin Classic which is over $100, Eboyas which cost close to $400, and the KOP which is close to $800. Yes of course the other 2 pens are "not in the same category" because they have gold nibs. But in essence they all have ebonite bodies, and I love them all.
I don't think it's unfair at all, considering the OP asked if it was a worthwhile purchase. And if you look at a few reviews on Goulet's site of this pen, a few customers have been unsatisfied with the build quality, while others love it. So there it's not a case of "This is made in Italy so it's a cut above Indian pens." It's the typical Conklin experience. If you get a good one, great. If you don't, it'll be "okay." In this case, if it's "Okay," it's $140. It's not a $40 Duragraph you can just accept if the threads are a bit sticky. I think it's very fair to say "There are other options here."
We aren't comparing a Mercedes with a Toyota. We're comparing pens made of ebonite, with the same shape, with the same nib, with the same filling system. It's not apples to oranges. It's comparing different apples.