There are several different ways to play this market Trevor and I've experimented with all of them on my server before making this post. Thank you for the tip btw, it's excellent!
Ok here goes:
1. You can post a dozen of these rods at 2-5 gold each and get bought out by the normal sellers who are trying to get upwards of 30 gold per rod.
2. You can compete with the primary sellers and only post 1-3 rods for a copper below the lowest price.
3. You can mix it up and do either strategy every other day depending on who else is selling and for how much.
I found that #3 worked the best, be flexible and figure out the demand on your server as well as how many people are selling.