I have purchased custom knives from Les, AZCK,Bladeart, etc. As far as I know they do not charge a "restocking fee".
I have regretably had to send two knives back both for the same reason. I live on an island in the middle of the pacific and have never handled many of the custom knives available. I get it and if it just does not "do it for me" then I sent it back. Both were from AZCK and both times Jay and Karen were so gracious, its scary! No restocking fee, no hard feelings, customer for life! (along with Les, Bladeart, Nordic Knives, etc.....)
Cost of business is cost of business. You buy a car and you have three days to return it for a full refund. As long as a knife is unused then there should be no "restocking fee", otherwise those "restocked" knives which I am being charged for "renting" should be sold as "used" knives at a discount and I should be advised, up front, when I purchase my "discounted" knife that it has been sent to someone else for inspection then sent back and "restocked". If I buy a "product" and don't like it after I get it home, as long as I have not used it I should be able to return it for a FULL refund.IMHO