Well, wherever we strayed off to, I still stand firm that a vape store should never build coils for customers. Its like having a gun store giving every new customer a fully loaded firearm to take home.
Some people say its safer for a vape store to build an rda for a new customer rather than that person going home and trying it themselves. I dunno, but I believe you have no business vaping sub ohm if you cant build, monitor and maintain it yourself, let alone understand what it is you are doing in the first place.
Yeah, that's another great point, if the customer doesn't know how to build it, he won't know how to check for shorts.