Counter-Suggestion: 0.8 keys rarely happens and is a quicksell/quickbuy price. 1 key is the most common buy/sell price.

Sellers:

http://www.tf2outpost.com/trade/12798085 - 0.9 - rarely bumps it, had an add within a day of posting

http://www.tf2outpost.com/trade/12976104 - 1

http://www.tf2outpost.com/trade/12976104 - 1

http://www.tf2outpost.com/trade/12979572 - 1

http://www.tf2outpost.com/trade/12986201 - 1

http://www.tf2outpost.com/trade/12989195 - 1

http://www.tf2outpost.com/trade/12990141 - 1

http://www.tf2outpost.com/trade/12990141 - 1

http://www.tf2outpost.com/trade/12963425 - 1

http://tf2tp.com/trade.php?trade=9647001 - 1

http://www.tf2outpost.com/trade/12936471 - 1 (offered 0.75)

http://www.tf2outpost.com/trade/12934925 - 1.1 (offered 1 key)

Solds:

http://www.tf2outpost.com/trade/12976626 - 0.8 - sold instantly

http://www.tf2outpost.com/trade/12931667 - 0.8 - sold instantly

http://www.tf2outpost.com/trade/12668318 - 1 - has many and has sold at least 1

http://www.tf2outpost.com/trade/12899277 - 1

http://www.tf2outpost.com/trade/12896161 - ts paint

http://www.tf2outpost.com/trade/12989856 - buyer for a 1 key item

Genuines don't sell instantly. Any price that sells instantly shouldn't be in the range. Some of the links on the other suggestion are never bumped and at least one of his unsolds at a key for a week has many and has sold at least 1 for a key.