You can't pull a range from single sale, if there is only one sale, the value must be exact

https://gladiator.tf/time-machine?item=Death+at+Dusk+Horrific+Headsplitter&at=2023-10-07T03%3A14%3A00.000Z

and high end is 200 keys, according to rules:

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

"Overpay in its purest form

No sale should be valued higher than a hat's buyout in pure if that buyout was up for a reasonable amount of time. If a person in the comments of a trade states a willingness to sell for "x" pure, the trade should not be valued above "x."

Overpay is supposed to represent the pure value of any item. If an item sells easily (under a week) for a certain amount in pure and regularly gets offered a certain amount in pure, it should not be valued less than that in the suggestion."