They all say how much they cost in the Store, if you click Actions under the Store menu. According to that, Thief costs 10.58, and I think you can steal as much as you want, but the more you try to steal the less chance you have that it will be successful. As for the Bank, I don't think you gain interest (correct me if I'm wrong, because I really don't know) but you can't get goop stolen if it's in the Bank. And you can deposit and withdraw whenever you like. Sticky Thread is that you can sticky a thread of yours to the top of the board, no matter how often it gets replied to, it stays at the top. Give Forum Access is the same as Buy Forum Password, but it gives a friend access to a board rather than yourself. Glowing Username costs 560.63.

As I said, you can see descriptions and costs for everything here: http://www.bluegoop.net/boards/ushop.php

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