It has a HUGE viewership! At least one vendor of khuks regularly puts up an item, and has links to his regular site, with other offerings there. Thus he vends one unit, and spreads the awareness through the link.
I don't know what the costs of operation are, however...so the cost/benefit would have to be up to you. Shipping is always taken as an additional cost to buyers. You may find HI's policy of including shiping to be of benefit to you as part of the offering, with appropriate caveats about overseas shipping.
The standard of offerings is generally in the POS range, with some rare exceptions.
Other considerations are: the spelling of the item (i.e., kukri, Khukri, gurka, ghurka, Nepal, Nepali, Nepalese).
I saw one ad, from a person in Texas, which described the khuk as a "Big ole knife with a crooked blade."
All these words factor in when a potential buyer comes in and "searches" for a specific word...either in title only, or "title and description." "Hand-made" etc...may also draw some folks to the offering.
You have talked about expanding your potential buyer universe...in that most of the knives you are selling seem to go to previous buyers.
eBay may help to spread the message, and give you more hits on the HI store site.
I think it would be worth the attempt.
Good fortune to you.
Kis
We're all in this together, somehow.