I think I'll start becoming more active in suggesting soon.

Using only 3 recent sales.

Bought mine for a Green Energy Furious Fukaamigasa:

http://www.tf2outpost.com/trade/26791410

Screenshot of the trade:

http://m.imgur.com/7cAOKwy

Proof of the effect of the Mullet:

http://m.imgur.com/nAh6TgD

Proof of the effect of the Fukaamigasa:

http://m.imgur.com/YcrbVUP

Total: 31 keys (Not applying overpay as the Fukaamigasa sold for pure in the mini suggestion)

Mini Suggestion for the Fukaamigasa as it is currently outdated:

Bought it for a clean Max's Severed Head:

http://www.tf2outpost.com/trade/26573737

Proof of the effect of the Fukaamigasa and the trade:

http://m.imgur.com/h8wDAtQ

History of the Max:

http://backpack.tf/item/146573459

Total: 31 keys (Its value at the time of the trade)

Sold it for a duped Vivid Plasma Industrial Festivizer, a Professional Killstreak Strange Rocket Launcher, a Professional Killstreak Strange L'Etranger, a Strange Dark Age Defender, a Genuine AWPer Hand and a Tour of Duty:

http://m.imgur.com/woRhdhI

Rocket Launcher:

http://m.imgur.com/64mkcvN

Proof of the effect of the Mullet:

http://m.imgur.com/91Lhrny

Proof of the effect of the Industrial:

http://m.imgur.com/imPCUrU

Total: 20.25 + [ (13 + 4 + 1 + 1)*0.9] = 37.35 keys

Rounding down it to 37 keys.

Mini Suggestion for the Strange Professional Killstreak Rocket Launcher:

It sells for around 13 keys on the SCM:

http://steamcommunity.com/market/listings/440/Strange%20Professional%20Killstreak%20Rocket%20Launcher

Mini Suggestion for the Strange Professional Killstreak L'Etranger:

It sells for around 4 keys on the SCM:

http://steamcommunity.com/market/listings/440/Strange%20Professional%20Killstreak%20L%27Etranger

Mini Suggestion for the Duped Industrial:

Sold it for a Haunted Ghosts Virtual Reality Headset:

http://m.imgur.com/kPdYyzg

Proof of the effect of the Industrial:

http://m.imgur.com/QT3lw32

Total: 20.25 keys (Not stacking overpay)

Mini Suggestion for the Virtual:

Sold it for a Haunted Ghosts Détective Noir:

http://m.imgur.com/K9MaHtD

Proof of the effect of the Virtual:

http://m.imgur.com/nVy1qWM

Total: 22.5*0.9 = 20.25 keys

Sale at 38 keys: (Credits to JPD)

http://i.imgur.com/8vE8pah.png

Please tell me if I did something wrong.