I have some of my own ideas, but I would love the hive-minds take on Trade Routes, and why it would be a bad thing to run trade routes from one province to another province within the same realm.

Game Rules wise; a character can connect a trade route from a guild, to another guild, and all that needs to be different is terrain type. So a 3 province realm, with three different terrain types, could run three different trade routes all within it's own border. Which is tempting for a guilder because that's GB in their pocket, but I'm looking for reasons why it would be a bad thing.

Thoughts?