I want to add another facet to the discussion. We are talking about sales strategy as we address the OP's question/issue.
I populate my sales display with a range of pen styles with an accompanying range of prices. The high end pens are priced at about a multiple of 4 to 6 times the price of the pens at the lower end (the lower end being the ones that sell the most). The mid and high end pens do sell, but at a lower rate, which is fine, in that they are there for a dual purpose:One, to get the high dollar sale when it happens and...Two, to justify in the mind of the casual shopper to buy a pen from the lower priced group. (The idea is to grab the low end buyer who would likely not have purchased anything otherwise.)
That was a statement of a sales strategy that works. Now, for the application to the self produced wood boxes. I include a low cost "presentation box" with the low end range pens. For the mid and higher cost pens (For me, any pen at $200 and above), I include the choice of any pen box on the display. The boxes on display are the ones that sell for $11 through $15 at PSI. These are very appealing boxes at a good value price to me. In comparison, I do not want to devote the time it would take me to produce pen boxes that would compete with these. I prefer to buy boxes and spend my shop time making pens.
I do have a plan in the works to offer a VERY HIGH END BOX, as a stand-alone item which will retail for about $150. I know my market, and this box will sell to the purchaser of the high end buyers, as those folks fit in the :"See it, Want it, Buy it" category, and they are not concerned about the total cost, since they have an excessive amount of the $$ needed to consummate the deal.
I hope this somewhat long winded discussion is helpful. A brief summary statement: It is not a good choice to make/sell nice wooden pen boxes. It is not cost effective vs the available commercial alternatives (such as the typical PSI offerings). [One man's opinion based on 20 years behind my pen/other items vendor sales table.]