And now we are much more in agreement
I actually
did crunch the numbers, and over time the amount of continual lights would become quite high:
Continual light/flame - how common are they?
We are again in agreement.
Perhaps it is time I write a post crunching some numbers?
But very quickly. We know historically that some areas exported a lot of swords blades - Toledo and Solingen for example (Damascus may also belong on this list, but I'm not sure). These blades are less than 4 feet long, and a lot of them could fit in a bag of holding. (and let's have something so they don't pierce the bag, not hard).
Let us assume:
1: the naked blade is "worth" 10 gp (meaning the portion of the retail price of the sword that comes from the blade is 10 gp, the rest of the retail price is made of the hilt, finaly sharpening, scabbard etc). But the merchant is selling them for 5 gp, he's just part of the supply chain. Let us also assume that the merchant bought the blade for 2.5 gp. Thus the merchant makes a raw profit of 2.5 gp per blade
2: Let us assume this naked blade weights 2 pounds (a bit high but easy math - also the "slack" is taken by some packing material)
3: 250 blades and some packaging material = 500 pounds = 625 gp raw profit.
Sure, if you're shipping grain, use a boat! But you don't need to be trading rare spices for the bag of holding to be very valuable