The vault is not free because it requires a lot of resources for the server to "open." Even if only viewing, it's the same as if a player intends to take something out. Like anything else, just have to remember what's there. Or, upgrade your vault till it becomes free
Instead of viewing the vault in game, how about a "Vault" tab that allows your to view your vault, the vault preview will only be generated when the player disconnects, and thus less stressful for the servers
Although this is a problem that no longer affects me (free vaulting ) what I think you should e able to do is /vault search [item name or id] and in a chat that only you can see, it says "item- total [number in vault] and lists how many are in each vault (if none then it says something or if you have some In one page and none in another it doesn't say anything for the page without that) Of course I see this being a problem with custom items, but it could just include it in whatever it was customized from
