Think about it for a moment: Would you rather have your team invest their time selling a $700 scope and all the mounting hardware to a customer trained to mount it themselves, or sell the same scope and mounting hardware with the employee tied up for an hour mounting it for the customer (often for free because they bought the items there) instead of selling another retail item?

This isn’t to say you would never mount a scope for a customer, but having a population of customers who can install the scope and hardware on their own usually can free your staff to go back into sales mode. As a nice kicker, everything a customer would need to mount, install and align a proper scope setup requires a nice collection of tools that can be a secondary wave of add-on purchases with great margins.