Ha, I guess. But why would they trust me over just saving up in a wallet they own? It's sort of like a weightloss deal to themselves? "I will become private"
big retailers used to offer layaway and its a big thing during downturns in the economy. In fact, I think the concept was invented in the Great Depression and was used a lot again during 2008. A lot of people do not have financial self-control. So if they have a retailer holding the money for the product for them, then they will not spend it on something else, which they might otherwise do.