The biggest mistake I see in retail is overstocking complex devices without the staff to explain them. If your team can't confidently walk a customer through settings, that fancy box mod becomes a return waiting to happen.

Complex devices also cost more upfront. That's fine if the customer knows what they're getting. But if they're upgrading from a disposable, the sticker shock can be a dealbreaker. You end up with a product that sits on the shelf, gathering dust.

That's why I always tell buyers: don't commit to the high-end wall until you've seen real demand. Start with a couple of mid-range options and let customers vote with their wallets.