Just like your Pool party suggestion here http://backpack.tf/vote/id/55c75013b98d88bb658b4615 Alot of your math is off again.

I won't bother with the 3.25 key trades, since they're below your price.

http://www.tf2outpost.com/trade/26723601 3 keys 6 ref is 3.375, which rounded is 3.4 keys not 3.3 keys.

http://www.tf2outpost.com/trade/26729976 Quicksold for 3 keys 6 ref.

http://www.tf2outpost.com/trade/26684089 Sold without a bump at 3 keys 6 ref. Same rounding here.

http://www.tf2outpost.com/trade/26709636 3 keys 6 ref, see above

http://www.tf2outpost.com/trade/26464940 3 keys 6 ref. See above

http://www.tf2outpost.com/trade/26710740 Sold for 3 keys 6 ref.

http://www.tf2outpost.com/trade/26729976 Sold for 3 keys 6 ref.

Sellers at "3.35" keys

http://www.tf2outpost.com/trade/26638700 3 keys 7 ref is 3.435, which would round down to 3.4 keys. This has sold TWICE since the trade.

http://www.tf2outpost.com/trade/26660394 Same as above, none in stock to sell.

http://www.tf2outpost.com/trade/26729053 Same price as above.

Some of your 3.5 key trades aren't 3.5 keys.

http://www.tf2outpost.com/trade/26711901 3 keys 10 ref is well over 3.5 keys.

http://www.tf2outpost.com/trade/26689390 Sold for 3.5 keys

http://www.tf2outpost.com/trade/26690067 4 days unbumped. Invalid.

http://www.tf2outpost.com/trade/26708915 Valid unsold at 3.5 keys.

http://www.tf2outpost.com/trade/26527045 2 weeks unbumped and also sold. for 3.5 keys.

http://www.tf2outpost.com/trade/26725370 Young, but valid when it matures.

http://www.tf2outpost.com/trade/26727322 Same as above.

There's nothing here supporting 3.33 keys, but there are solds at 3.5 keys which would mean if a drop is needed, 3.5 keys would need to still be in the range due to having success.

round to the nearest 1 dp please

Your classifieds only have 4 around your price range which means not many people are selling that low

http://imgur.com/a/Sqj3w

Sales at 4 keys

http://www.tf2outpost.com/trade/26496540#latest sold 12

Sales for 3.5 keys

http://www.tf2outpost.com/trade/26689390

http://www.tf2outpost.com/trade/26702039

http://www.tf2outpost.com/trade/26689390

http://www.tf2outpost.com/trade/26638700

Sold for 3.4 keys without a bump

http://www.tf2outpost.com/trade/26684089

Buyer at 3.25 keys rounding to 3.3

http://www.tf2outpost.com/trade/26464940

Round to 3.3.

How is this still up? It isn't even rounded.

Quite a few unsolds have sold. This with additional proof in comments suggest that this still sells at 3.5.