As implied from the question, what gives Unusuals their values? I've seen many different unusuals go from 1-2 buds, to as many as 20-25 buds? What gives Unusuals their value?
closed as not constructive by OrigamiRobot, Michel, deutschZuid, kotekzot, Shadur Mar 31 '13 at 8:31
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In short, they are valued at what people are willing to pay for it.
For example, a burning flames team captain has an astronomically high value, as it is considered by many as one of the best hats in the game with one of the best unusual effects. Other hats, like the Nutz n' boltz football helmet only yields 15 keys or so.
If you go to Backpack.tf's unusual pricing guide, it shows how much unusuals have been traded for in the past. The value of your unusual is completely arbitrary; it's only as valuable as the agreement of its worth between the buyer and the seller.