It would be nice if you could link the few sellers there are; I'm still gonna up-vote though cause you're Hugh Jazz and this will pass regardless of the proof.

I was just about to make this myself. Here's all the proof I collected. (This is a rough draft of a copy-paste I was going to make to suggest this):

Giving this hat a little bump. It seems that people are readily putting up offers of 1 key, and outpost trades have people willing to pay a key and a ref (currently 1.25 keys). This is still attainable at 1 key, so I’m not proposing a drastic increase for the price here. Just a love tap.

Waited to sell my Whoopee Cap before putting this up, in an attempt to prove I’m not trying to raise the price of my backpack.

I’m actually surprised, there seems to be a somewhat good bit of interest in this hat. Not what I had expected. Proof below.

On another note, most people can agree that most willing buyers look for below bp.tf prices for items in order for resell, but this seems to be disproven by the readiness of buyers.

Willing buyers

http://www.tf2outpost.com/trade/8781625 No notes, 1 key 1 ref

http://www.tf2outpost.com/trade/9138960 1 key

http://www.tf2outpost.com/trade/9141711 1 key

http://www.tf2outpost.com/trade/8327960 1 key (says so in comments)

http://www.tf2outpost.com/trade/9109234 1 key

http://www.tf2outpost.com/trade/8927660 1 key

Insane Highball Sellers and Lowball Buyers

http://www.tf2outpost.com/trade/8152645 Unsold at 1.2B (Current Bitcoin rate is 1 B = $46)

Sellers above 1 key

http://www.tf2outpost.com/trade/8215048 Declined offer of one key, one key + .33 + weapons, declines offer of 1 key + clean chops (for a total offer of about 2 keys)

http://www.tf2outpost.com/trade/7494070 tons of adds at 2 keys for Lime painted, some overpay offers in items (like G. Quadwrangler)

Sellers at 1 key

http://www.tf2outpost.com/trade/9211571 Gold Painted sold for 1.25 keys

Remember I'm just adding to what you have here, but this wasn't completed data.