I've done substantial amounts of a/b testing and experimentation around ecommerce pricing and it's pretty rare for a maxim like "show your costs to boost sales" to hold to in either 1) the long run or 2) across multiple product types, audience types, brands etc.

Especially with something relatively novel like this, results are very prone to bias since novelty has the tendency to increase purchase-intent in the short-term.

As far as audience, I'd say the audiences of folks interested in a $115 wallet, Harvard students, Everlane/J Crew shoppers, and craft cocoa buyers are on the more affluent and/or intelligent side, which may compound the novelty effect or at least have the transparency resonate more.