Last suggestion for this taunt. Prices all seem pretty accurate now.

New price: 5-6.5 keys

Proof:

Sale #1 (3 weeks)= invalid

https://backpack.tf/profiles/76561198259098579#!/compare/1529107200/1529193600

Sold for a showstopper deep fried. Used there.

Sale #2 (1 month)= 5.5

https://backpack.tf/profiles/76561198306756308#!/compare/1528934400/1529020800

Sold for 5 keys 10 ref. Rounding to 5.5.

Sale #3 (1 month)= invalid

https://backpack.tf/profiles/76561198393570128#!/compare/1528243200/1528675200

Sold with a strange rl (~0.25 keys) for a power surge halogen head lamp. Better used there.

Sale #4 (1 month)= invalid

https://backpack.tf/profiles/76561198205939253#!/compare/1526860800/1527206400

Bulk.

bot.tf sales:

https://bot.tf/stats/item?def=1119&q=5&ef=Screaming+Tiger&craft=1&aus=0&ks=0

https://imgur.com/a/YZdpqb6

https://backpack.tf/profiles/76561198305676157#!/compare/1523570400/1523656800 - 6 keys 7 ref = ~6

https://backpack.tf/profiles/76561198305676157#!/compare/1523829600/1523916000 - 6 keys 7 ref = ~6

https://backpack.tf/profiles/76561198305676157#!/compare/1524520800/1524607200 - 6 keys 15 ref = ~6.5

https://backpack.tf/profiles/76561198344933095#!/compare/1524693600/1524780000 - 6

https://backpack.tf/profiles/76561198305676157#!/compare/1524952800/1525039200 - 6 keys 15 ref = ~6.5

https://backpack.tf/profiles/76561198358932637#!/compare/1526421600/1526508000 - 6

https://backpack.tf/profiles/76561198386441509#!/compare/1526421600/1526508000 - 6

https://backpack.tf/profiles/76561198358932637#!/compare/1527199200/1527285600 - 5 keys 15 ref = ~5.5

https://backpack.tf/profiles/76561198386441509#!/compare/1528581600/1528668000 - 5 keys 15 ref = ~5.5

https://backpack.tf/profiles/76561198305676157#!/compare/1528668000/1528754400 - 5 keys 10 ref = ~5.5

https://backpack.tf/profiles/76561198312583107#!/compare/1529791200/1529877600 - 6

Marketplace.tf sales:

https://marketplace.tf/items/1119;5;u3006

Sale #1 (2 months) Sold for 10.01$. Keys were 1.97$. 10.01 / 1.97 = ~5

Sale #2 (2 months) Sold for 14.99$. Keys were 1.97$. 14.99 / 1.97 = ~7.5

Sale #3 (2 months) Sold for 10.05$. Keys were 1.96$. 10.05 / 1.96 = ~5

Sale #4 (2 months) Sold for 14.99$. Keys were 1.96$. 14.99 / 1.96 = ~7.5

Sale #5 (1 month) Sold for 14.00$. Keys were 1.96$. 14.00 / 1.96 = ~7

Sale #6 (1 month) Sold for 15.50$. Keys were 1.94$. 15.50 / 1.94 = ~8

Sale #7 (3 weeks) Sold for 10.00$. Keys were 1.92$. 10.00 / 1.92 = ~5

Sale #8 (1 week) Sold for 13.00$. Keys were 1.98$. 13.00 / 1.98 = ~6.5

_________________________________________________________

SUMMARY

Sales:

5 x3

5.5 x4

6 x6

6.5 x3

7 x1

8 x1

https://imgur.com/a/kHSdVes

Unsold for 2 months at 7. Excluding 7+.

Going with 5-6.5 keys.

Feel free to add proof to support or counter my new price.