Meh irrelevant 3 key links but I'll upvote.

Difference between this suggestion: http://backpack.tf/vote/id/51746febba25360965000005

And this one...

This one has good proof. But 3 keys unsold doesn't really matter...

Really sad... was beaten to the punch making this... D:

Here was the evidence that I had typed out. Let it be used as further evidence!

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Long story short, many sellers are selling for less than 2.5 keys, and many buyers are either successful or have interested sellers when purchasing one below 2.5 keys.

SELLERS:

http://www.tf2outpost.com/trade/10257765 - 2 keys

http://www.tf2outpost.com/trade/10252194 - 2 keys

http://www.tf2outpost.com/trade/10221113 - 2 keys

http://www.tf2outpost.com/trade/10213533 - 2 keys + 1.00

http://www.tf2outpost.com/trade/10252074 - 2 keys + 1.66

http://www.tf2outpost.com/trade/9923408 - 2 keys + 2.00

http://www.tf2outpost.com/trade/10227287 - 2 keys + 2.00

http://www.tf2outpost.com/trade/10230688 - 2 keys + 2.00

http://www.tf2outpost.com/trade/10232209 - "a little less than 2.5 keys"

SUCCESSFUL BUYERS:

http://www.tf2outpost.com/trade/10160430 - A Distinctive Lack of Vincent's trade. 2 keys each. I asked him, says he purchased five in the last five days (PROOF: [URL]http://imgur.com/8nQjr5q[/URL]). Thanks Vincent!

http://www.tf2outpost.com/trade/9332761 - 2 keys. 1 add (1 day ago), 1 add (5 days ago). One offer of 2 keys + 1.00 (4 days ago), one offer of 2.5 keys (5 days ago).

http://www.tf2outpost.com/trade/10137732 - 2 keys. 3 adds (4 days ago), 1 add (3 days ago)

http://www.tf2outpost.com/trade/10150887 - 2 keys + 0.66. 2 adds (1 day ago), one interested (2 days ago), one add (4 days ago)

http://www.tf2outpost.com/trade/10219907 - 2 keys. One offer of 2 keys + 2.00 (1 day ago).

Conclusion: That one terrible suggestion from earlier ([url]http://backpack.tf/vote/id/51746febba25360965000005[/url]) was actually more accurate than you think. You can easily get the Genuiine Shred Alert taunt for less than 2.5 keys now!

2 keys, but still no one buying....

This is even harder to sell at 2 keys.

Here's a couple more unsold at 2 keys:

http://www.tf2outpost.com/trade/10201899

http://www.tf2outpost.com/trade/10155906

I found more but when I double-checked, they'd already been posted here. So I didn't include them.