This would make a Great misc

http://www.tf2outpost.com/trade/19707892 Sold for Arcana Pith helm (3.9 buds after mathz) outlier

http://www.tf2outpost.com/trade/19635415 Sold for Blizzardy Fro + Stormy Nappers ( 1.3 + 1.4 = 3 buds )

http://www.tf2outpost.com/trade/19620532 Sold for Sunbeams Capotain ( 2.6 buds )

http://www.tf2outpost.com/trade/19547604 Sold for Purple Energy Fro ( 3.2 buds )

http://www.tf2outpost.com/trade/19657992 Sold for Disco Slick cut ( No price )

Conclusion : 3.9 buds is a outlier as most sales are commonly round 3 or so. This is all the proof I could find.