That would be extremely hard to implement, and I am not sure if that is even doable. Anyways, the whole point of all the vault charges is so that you make it your goal to get more vaults so that you can open your vault for free.
True, just rack up 40 k and buy 4 vault pages. Free vault!! So after opening your vault 4 k times, the 40 k you first spent will pay itself off. Simple.
well, could see that pressing the button would trigger the command /vault page 2, etc., from there all they would need to add is vault page next/previous to avoid flipping to the wrong page
That is a good idea. I'd also like a to be able to list my vault pages. I realise not many people have lots of vaults, but i have a lot. And i'm starting too loose track of them. It would be nice to be able to list all my 50 vault page names. /vaultlist - /vaultl /vaultnext - /vaultn /vaultprevious - /vaultp
You might consider adding the revisions to your idea in the main post. That way, people won't become confused as I did. You'd have to hack CraftBukkit to put a scrollbar on a double chest inventory.
To do this, the server would need a mod that everybody that wanted to play would need to get. This server WONT do this.
There could be a vault menu, but you wouldn't be able to go back to the menu from a vault page. The menu would have item buttons that when clicked would close the menu, or take you to the chosen vault. (the menu would be free to access. It would charge you when you selected the page)