EDITED: Hey, i have seen many people sell these on outpost and the value is dropping a lot.

Proof

Sellers

[url]http://backpack.tf/classifieds/id/76561198064936246[/url] Selling for 2.22!

[url]http://www.tf2outpost.com/trade/9969239[/url] selling for 2 keys + 1 ref

[url]http://www.tf2outpost.com/trade/10259540[/url] Selling for 2 keys + 1 ref

Buyers

[url]http://www.tf2outpost.com/trade/10192902[/url] - Buying for 1 key

[url]http://www.tf2outpost.com/trade/9758909[/url] - got offered 2 keys by Arrowpointiz

[url]http://www.tf2outpost.com/trade/10264973[/url] - bought 2 for 2 keys each.

[url]http://www.tf2outpost.com/trade/10290648[/url] - buying for 1 key 4 ref

[url]http://www.tf2outpost.com/trade/9773593[/url] - offered 2 keys by Breadfish, owner declined.

[url]http://www.tf2outpost.com/trade/9912823[/url] - buying for 1 key

[url]http://www.tf2outpost.com/trade/9625817[/url] - bought 1 for 1 key from Dr. Jiggsy

[url]http://www.tf2outpost.com/trade/9616240[/url] - buying for 2 keys (one add for the cockfighter in comments)

Overall i think that the lower tier should stay at 2 keys but the higher tier should decrease because many are being sold for 2 keys and some for 2.25.

p.s. Don't be harsh my first suggestion :S