Overpay calculated where necessary

http://www.tf2outpost.com/trade/13614349 - Looking at http://backpack.tf/id/76561198042262539?time=1376290800 , it looks like it sold with 12 keys for a Miami Titanium Tyro (5.7 - 0.6 = 5.1). However this trade is redundant as they appear to have traded back.

http://www.tf2outpost.com/trade/12424165 - Talked to Nicky, thought he sold it for either 5 or 4.5. Let's say 4.5 since that was his b/o. http://puu.sh/4fypu.png

http://www.tf2outpost.com/trade/12965805 - B/O of 4 buds, offer of a miami firewall (4.6 buds)

http://www.tf2outpost.com/trade/11436688 - Sold with a GBH Hermes for a Knifestorm Ballcap (6.3 - 3.1 = 3.2 buds)

Bit of a big range, but I wanted it to include all the sales and decent offers within the last 2 months.