Counter suggestion. I'm counter suggesting because Flipper only used 1 sale when he could have used more, as there were more sales available.

Credit to Flipper for finding some of the proof.

My proof:

http://www.tf2outpost.com/trade/18819881 was "quickselling" for 17 keys. (took 2 days to sell, not a quicksell for a low tier hat)

http://www.tf2outpost.com/trade/18685576 sold for a bud.

Flipper's proof:

Sold for one bud (19.5 keys ) and the seller gave to the buyer 2 keys ---> 19.5 - 2 = 17.5

Proof : http://www.tf2outpost.com/trade/19184830

Seller's Backpack : http://backpack.tf/profiles/76561198067578843 here you can see the bud he just received

Buyer's Backpack : http://backpack.tf/profiles/76561198081359492 the unusual + 2 keys

Rounding 19.5 up to 20 (ew, ugleh ranges)