It sure would be cool to have an item that will allow a user that has it to gain a % more credits per post/topic/word (if you give credits for that).
And perhaps, when creating the item in /admin, you can set how long it exists for, like, set it to work for 12 hours then disappear, or a week and then disappear. And obviously, you'd mark the price up depending on how long it's usable for