Thanks to blind polar bear for the proof :D

Other suggestion wasnt entirely accurate. And here's sum proof:

B/O = 1.45 pure - http://www.tf2outpost.com/trade/10621961

B/O = 1.5 pure - http://www.tf2outpost.com/trade/10117565

~1.6 - http://www.tf2outpost.com/trade/9869905 - sold for strange Kritz

One is selling for 1.5 pure, and below current range http://www.tf2outpost.com/trade/10608897

Offered a strange Gunslinger, and an Orb Fire Fed. Fedora, both ~1.3 buds, declined both http://www.tf2outpost.com/trade/10602611

Offered a Smoking Fez (~1.4 buds) , and a Smoking Tyrannus +4 keys (~1.3), declined both http://www.tf2outpost.com/trade/10573544

Was offered ^those two unusuals, an S. Kritz, and a Stormy Toque(~1.1 buds) http://www.tf2outpost.com/trade/10576297

Apparently offered a bud + a Blizz Nano (~1.6 buds), offered 30 keys pure, offered a Smoking Lucky Shot(1.5 buds), offered Orb Fire Yellow Belt and Orb Fire Big Country(~1.9 buds), and some more unusual offers http://www.tf2outpost.com/trade/9176237

CONCLUSION: 4 month old price, needs an update, as most B/O's are below the current range. The offers tend to gravitate between 1.3 buds and 1.6 buds, with some outliers such as the Stormy Toque and the 2 Orb. Fire unusuals.