Hussar
Legend
He might care, but, wow is he absolutely bad at it. It's 1100 miles from Waterdeep to the closest town in the Dalelands as the crow flies. It would be much closer to almost 2000 miles overland, most of which is not by any sort of water route meaning that any realistic trade is impossible. It's not like they're shipping spices or silks out of Waterdeep. Metals? Overland? For those kinds of distances? Not happening.Oh, boy, talking about the weeds again:
Waterdeep is very roughly ~800 miles from the Anauroch (measuring woth my thumb and pointer finger on the SCAG map, might be off), and not remotely coincidentally, Waterdeep is directly in line with the Northern border of the High Moor. Thwt means that anything in the square between the Anaouroch and the High Moor and accompanying mountains (an area which is absolutely enormous and resource rich) has only one natural outlet to bring raw materials to the outside world that will pay top dollar: even going further North om the Sword Coast has to go through Waterdeep to supply. So, yeah, everything from the "Savage Frontier" gers traded overland through Waterdeep. Ed Greenwood cares about that particular sort of thing a lot.
Not when you can leave from Baldur's Gate, put it on a ferry nearly the entire distance and have actual roads the rest of the way. Eastern trade most certainly is not leaving from Waterdeep.