I know that it's a big jump, but I have enough proof to back it up.

At first, the price is 9 months old >_>

I had 2 Smoking Attendants. I sold one for a Circling Heart Hottie's Hoodie + 4 Keys, this is about 3.1 buds with unusual-overpay. http://puu.sh/2aJr3

My hats were the only ones on the market for a long time. I had an offer of 3 pure about 5-6 weeks ago but I was too late, the person bought something else. http://puu.sh/1Ut2L

Another person posted on my trade that he may buy one for my price of 3 pure buds. http://www.tf2outpost.com/trade/8750964

http://www.tf2outpost.com/trade/7214596 - Wants to pay 3 pure for a Smoking Attendant. One of the buds is gifted, I take this as ~2.8 buds

All in all I come to a range of 2.7 - 3.1 buds.