Ladder - 5 cp
Pole - 2 sp
You buy 20 ladders with a gp, you break them up and sell the 10 foot poles at half market value for 4 gp. You keep doing so until the town/city runs out of ladders or the price of poles decreases. This is simply an example of how WotC did some bad pricing.
It looks suspiciously like a typo. If I circulated something like that to my players, and they came back with this zany scheme, my short reply would be, "Sorry guys, that's 5
silver for the ladder"...
If I say something in my campaign I'm not going to be a dick and turn around and say no ladders are now 4 sp!
...which means I'm a dick.

It's cool, lots of people say that about my unwillingness to grant the WotC logo a kind of special status in 3.X games.
Seriously, though, if you pay this kind of attention to detail with your own work, you won't get 'unbalanced' results. And anyway, D&D is a game about adventure and exploration, not poring over equipment lists to find a way for characters to get easy money.
In this case and hopefully all future cases I will have a method that I can simply look up. Keep in mind there's little hack and slash in my campaigns. We can easily go through eight hours of real time while avoiding combat scenario after another.
What does hack-and-slash have to do with this? I will admit to having dismissed your concerns over data for accurate pricing, and take it that I'm being accused of being a role-playing primitive for having such an attitude. If that's where you were going, my reply is two words.
And it's not "home brew".
Look, I understand your frustration, but discussion forums are generally bad for what you're trying to do. You get lots of
opinion out of them, but not a lot of
data - unless you want data on what various groups of netizens think. I recommend
searching the forum for posts on this sort of topic (someone else may have posted it in a, "here you go!" type thread), and using the forum for bug-checking. Plenty of people on here are prepared to go over new material and give feedback, often of a high quality.