Bubbling Plumber’s Pipe

New price: 9-10 keys

[proof below]

SALE #1 = 9 keys

https://backpack.tf/profiles/76561198317543112#!/compare/1499126400/1499212800

Sold for 8 keys + 15 ref. Keys are currently 30 ref so sale would round up to 9 keys. Keys were slightly cheaper when the sale occured so should be fine to value this at 9 keys.

SALE #2 = 10 keys

https://backpack.tf/profiles/76561198210812853#!/compare/1498521600/1499299200

https://backpack.tf/profiles/76561198197287330#!/compare/1499212800/1499299200

Sold for 10 keys.

SALE #3 = 9 keys

https://backpack.tf/profiles/76561198069401075#!/compare/1499644800/1499731200

Sold for 9 keys.

SALE #4 = invalid

https://backpack.tf/profiles/76561198066363827#!/compare/1499817600/1499904000

Sold for 8 keys to a quicksell bot.

SUMMARY

Sales: 9 / 9 / 10 keys

Sellers: 10 / 12 keys

http://i.imgur.com/omPWKoW.png

Scrap.tf unsold at 10 keys for 3 months, proving that the current price is way too high. Going with 9-10 keys.