Pro KS

https://marketplace.tf/items/tf2/15007;15;w2;pk7;strange;kt-3;festive

$49.99 / $1.77 = 28.24 keys https://backpack.tf/item/5359928765

Pro KS

https://marketplace.tf/items/tf2/15007;11;w2;pk7;kt-3;festive

$78.65 / $1.86 = 42.28 keys https://backpack.tf/item/5359928765

$84.99 / $1.92 = 44.27 keys

https://steamcommunity.com/market/listings/440/Strange%20Festivized%20Professional%20Killstreak%20Purple%20Range%20Sniper%20Rifle%20(Minimal%20Wear)

https://steamcommunity.com/market/pricehistory/?country=US&currency=1&appid=440&market_hash_name=Strange%20Festivized%20Professional%20Killstreak%20Purple%20Range%20Sniper%20Rifle%20(Minimal%20Wear)

$47, which is pro ks buyer price https://gyazo.com/3146822b7c6d3e77289e0cfd9f5826ad

//

https://marketplace.tf/items/tf2/15007;11;w2;pk7

$38.89 / $1.78 = 21.85 keys

https://backpack.tf/profiles/76561198068786753#!/compare/1605744000/1605830400

https://backpack.tf/profiles/76561197994697258#!/compare/1605657600/1605830400

Bulk

https://backpack.tf/profiles/76561198093031738#!/compare/1602201600/1602288000

https://backpack.tf/profiles/76561198295073460#!/compare/1601942400/1602288000

23 keys

https://backpack.tf/profiles/76561198277366774#!/compare/1608940800/1609113600

https://backpack.tf/profiles/76561198408606810#!/compare/1608854400/1608940800

Untraceable

https://steamcommunity.com/market/listings/440/Strange%20Purple%20Range%20Sniper%20Rifle%20(Minimal%20Wear)

https://steamcommunity.com/market/pricehistory/?country=US&currency=1&appid=440&market_hash_name=Strange%20Purple%20Range%20Sniper%20Rifle%20(Minimal%20Wear)

["Oct 01 2020 01: +0",50.02,"1"] = 22 keys

["Oct 29 2020 01: +0",53.89,"1"] = 24 keys

["Nov 04 2020 01: +0",39.11,"1"] = 17 keys

["Dec 25 2020 21: +0",57.5,"1"] = 25 keys

https://steamcommunity.com/market/listings/440/Strange%20Specialized%20Killstreak%20Purple%20Range%20Sniper%20Rifle%20(Minimal%20Wear)

https://steamcommunity.com/market/pricehistory/?country=US&currency=1&appid=440&market_hash_name=Strange%20Specialized%20Killstreak%20Purple%20Range%20Sniper%20Rifle%20(Minimal%20Wear)

["Dec 18 2020 19: +0",54.356,"1"] = 25 keys

pro ks obviously makes a difference, so excluding those

sales without pro ks

17

22

22

23

24

25

25

17 look low

22-25