Re-suggesting. Thanks Randy for reminding me.

Sale 1: Sold with 14 Robo keys for Scorching Flames Prospector[37.5 keys]

http://backpack.tf/profiles/76561198162307646/#!/compare/1457683200/1457769600

37.5-14=23.5 rounding to 24 keys

Sale 2: Sold for Disco Beat Down Towering Titanium Pillar of Hats[37 keys via mini]

http://www.tf2outpost.com/trade/27674379 b/o was 30 keys

http://backpack.tf/profiles/76561198162307646/#!/compare/1457596800/1457683200

Capping it at the b/o of 30.

Sellers at 24 and 25 keys:

http://puu.sh/nMlYb/d68eb6a68c.png

Mini on Pillar of Hats:

Sold for Miami Nights Headsplitter

http://backpack.tf/profiles/76561198137832611/#!/compare/1456041600/1456473600

Mini on Headsplitter:

Seller at 37 keys: https://gyazo.com/9b4971ea255c8758f77a50041ed223eb.png

So I have sales at 24 and 30, but there are also sellers at 24 and 25 keys.

Making this 24 keys flat, and calling 30 keys the outlier here.