Get money and laugh at poor people.

I'm kidding. Don't.

https://backpack.tf/item/2567148141

Sale 1) Sold for a Skill Gotten Gains Burstchester (58 Keys)

https://backpack.tf/profiles/76561198021383012#!/compare/1495929600/1496016000

http://www.tf2outpost.com/trade/28905646 - Capped by the Buyout of 49 Keys

Burstchester Mini

https://backpack.tf/suggestion/59640281cf6c757a76288a30 - 58 Keys

Sale 2) Sold for a Factory New Cool Butcher Bird Grenade Launcher + ~3 Keys of Items

https://backpack.tf/profiles/76561198114635132#!/compare/1498176000/1498262400

Would be better used for the Grenade.

https://backpack.tf/item/4782375401

Sale 3) Sold + 4 Keys of Items + 2 Keys for a Hellish Inferno Zoomin' Broom

https://backpack.tf/profiles/76561198037815936#!/compare/1492819200/1495670400

http://www.tf2outpost.com/trade/29194409 - Capped by the Buyout of 53 Keys

Sale 4) Sold for a Neutron Star Hottie's Hoodie (26 Keys) + Duped Green Confetti Mining Light (25 Keys) + 3 Keys

https://backpack.tf/profiles/76561198050105938#!/compare/1496016000/1496102400

26 + 25 + 3 = 54 Keys

Mining Mini

https://backpack.tf/profiles/76561198203040187#!/compare/1496275200/1496448000 - Sold for a Circling TF Logo L'homme Burglerre (22 Keys)

https://backpack.tf/profiles/76561198016070169#!/compare/1494288000/1494374400 - Sold + 10 Keys for a Purple Energy Industrial Festivizer (34 Keys)

https://backpack.tf/profiles/76561198016070169#!/compare/1494892800/1494979200 - Sold for 28 Keys