|A Typical World|
What most people would want to do with a trade system, with a typical world that I see posted on line, to resounding cries of "I love your art style," would be a cake walk for me. The map on the right, from socksandpuppets.com, consists of 12 habitations, not counting the "base camp." It would be easy to build up a distance table, then select a hundred products and build a trade system for this that would serve the world well enough to, as Ian Pinder said, "search for adventure" within that system.
It also came up, "Would I make the world itself?" A hundred years ago, back in 1984, after making a world that looked somewhat similar to the picture above, I was asked to make an imaginary world for others. At the time, I charged the outrageous price of $150. I can't imagine doing something like this now. Back then, I did hand drawings. Now, to do it on computer (as I am not hand drawing and shipping anything), I certainly wouldn't be cheap. And it wouldn't be worth it anyway. For what most DMs use a D&D world for, stealing a map like the one linked should be enough for them.
At this point, on this subject, I'm merely poking the bear. I doubt there are more than two or three persons who would find any use for this service, were I to offer it. I haven't hesitated in the past to monetize this blog, so I don't worry about that. I only wonder, is this something I want to actually do.