This is for suggesting prices, not buying items. If you want to purchase this item, you can place a buy order here:

http://backpack.tf/stats/Unusual/Your%20Worst%20Nightmare/Tradable/Craftable/57

Simply go to Buy Orders, then click Create New. If someone agrees with your price, they'll either add you to trade, or send a trade offer.

Then bust your ass and save up like half of the community does.

Well, hell. Why not go all out and price it at a scrap if you want it that much? It'll have the same effect.

at least this person writes why he wanna lower the unusual for what reason xD

The "I want this hat, but don't have enough pure so I'll lower the price so I can buy it" suggestion