It would appear to have sold for 9 keys here before in the compare links your provided:

https://backpack.tf/profiles/76561198045278633#!/compare/1611532800/1611619200

As far as your purchase goes:

https://backpack.tf/profiles/76561198212497608#!/compare/1611964800/1612051200

https://backpack.tf/profiles/76561198152451196#!/compare/1612051200/1612137600

Sold for:

Pyrophoric Personality Taunt: Buy A Life

10 keys

You would have to price the Buy a Life to price the Scoot.

There are also an awful lot more sales, this is a rather gargantuan task for a new suggestor. If you would like more advice, please feel free to join the backpack.tf discord for some more pointers.

for your edification, https://forums.backpack.tf/topic/6033-rules-for-unusual-price-suggestions/

(also has a link to the aforementioned discord)