Speculation of its use has died down after the Mecha Update. This needs a update.

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Sellers:

Unsold for 1 key

http://www.tf2outpost.com/trade/11447124 4 days

http://www.tf2outpost.com/trade/11440388 4 days

http://www.tf2outpost.com/trade/11495504 2 days

http://www.tf2outpost.com/trade/11495152 2 days

http://www.tf2outpost.com/trade/11544886 2 hours

Unsold for 1.2 keys

http://www.tf2outpost.com/trade/11487567 2 days

http://www.tf2outpost.com/trade/11429554 5 days

Unsold for 1.4 keys

http://www.tf2outpost.com/trade/11436349 4 days

http://www.tf2outpost.com/trade/11500726 2 days

http://www.tf2outpost.com/trade/11546296 1 day

Unsold for 1.6 keys

http://www.tf2outpost.com/trade/11156686 2 weeks!

http://www.tf2outpost.com/trade/11333767 1 week

http://www.tf2outpost.com/trade/11248530 1 week

http://www.tf2outpost.com/trade/11495159 2 days

http://www.tf2outpost.com/trade/11512323 1 day

http://www.tf2outpost.com/trade/11483675 2 days

Sold for 1 key

http://www.tf2outpost.com/trade/11519456 (originally unsold for 1 key+1 ref http://www.tf2outpost.com/trade/11518086)

Sold for 1.2 key

http://www.tf2outpost.com/trade/11516269 (Capacitors were not sold,but there was a willing buyer)

http://www.tf2outpost.com/trade/11136548 (Sold for 1 key+2 ref)

http://www.tf2outpost.com/trade/11409118 (success at 1:1 for filamentals which are 1.2-1.4 keys)

Buyers:

http://www.tf2outpost.com/trade/11357726 Buying for 5.33 refined,5 adds within 6 days

http://www.tf2outpost.com/trade/11359883 Buying for 3 ref,no success but rejected a seller at 1 key

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Conclusion is,capacitors at 1.6 keys are not moving and there are sellers at 1 key each. No one will pay 1.6 keys if there are sellers at 1 key. This is a rather conservative bump actually.