Economics: Teleportation Circle

So if there are 17th level wizards around would they create teleportation circle between major cities and eliminate trade routes? A two way portal would cost 2,000 gold, 9,000 xp, and the casting fee would be 1,530. Let's say the XP cost equates to 45,000 gold meaning 48,530 gold.

Seems like a lot, but this is less than 2 galleys. If major trade was going to occur then this would seem like a good investment. Of course, you would need to also build a large support infrastructure and you would really only go between major cities. And you would of course, need 17th level wizards running around.