DIY electronics/Maker support needs to stock lots of different small items that no one person might need to buy in a given day, so I'd bet you can't split your inventory as many ways as they do and survive as a business. How many storefronts could MakerShed support, for example? Plus rental of prominent store-frontage like mall space is probably some of the most expensive. For an Apple store with high product turnover, sure, but not for a reinvented RadioShack. Or if you do, maybe pick one single mall in a big metropolitan city, put a glitzy outlet there, and make it larger so it can hold the inventory people want and actually be a convenience compared to online ordering (rather than an inconvenience when you have to chase down which branch actually has a particular part in stock).