Resuggesting as recommended by Polar

Proof below. Overpay calculated. Original prices used

Sales

http://www.tf2outpost.com/trade/21526407

http://backpack.tf/profiles/76561198025022308?time=1408863600 ---> http://backpack.tf/profiles/76561198025022308?time=1409036400

87 keys = 4.5 buds

http://backpack.tf/profiles/76561198025022308?time=1406271600 ---> http://backpack.tf/profiles/76561198025022308?time=1406358000

Added 11 keys in items for a Ghosts Tyrant's = 5.4 buds (No overpay cuz offered)

http://backpack.tf/profiles/76561198010744735?time=1405148400 ---> http://backpack.tf/profiles/76561198010744735?time=1405234800

Max + 1 bud = 4 buds

Polar's Proof:

http://www.tf2outpost.com/trade/21845963 - duped eerie + 10 keys - http://backpack.tf/vote/id/5373a1814cd7b8cf368b4748 ~4.5

http://www.tf2outpost.com/trade/22045843 - a separate ghosts tyrants sale, this one for tyrants + 10 keys. tyrants is duped, so this is probably 5.5 after overpay

DUPED

http://www.tf2outpost.com/trade/22393566 - lvl 1 max + TW drill ~4.5-5? (drill b/os at 2 now)

Sales at 4, 4.5, 4.5, 5, 5.5, 5.5. There are lots of 4+ pure offers and even the duped one went for 4.5-5. I'd call 4 an outlier here and price this at 4.5-5.5

Help / Constructive Criticism / Additional Proof / Counter-Proof is ALWAYS welcome! >;3