I think a deposit should not be required, unless the maker is doing something that would not be readily sellable, or the materials are extravagent (e.g. ivory, jewels, etc.) There have been and will be knifemakers who are scam artists, have personal problems, health problems, coke habits and those that just exit the business. I don't think a customer should take that risk for a knife that is readily sold elsewhere. The risk to the knifemaker, as long as he's not an amatuer, is a slow down in cash flow due to circumstances beyond their control. If a problem with receipts doesn't happen but once every few years, that's not bad. Most small businesses that are not retail brick and mortar often have cash flow problems from collection of receipts.