Suggestion: The Big Kill at 9–10 keys

Well, your one month(!) trade isn't really unsold for 10 keys. If you look at the first few comments you'll see he was wanting a higher price before and has changed his price over time. Also, on top of that, the latest comment wants to buy it for 10 keys.

Which is still 4 days old. Honestly I might as well remove that link.

Which is sold. Look at the item history.

#outliner

A bit of your proof can already be eliminated just from checking item histories.

5th link, 9th link, 6th and 7th links are broken, 4th-last link was quicksold to Scrap.tf.

Honestly, 10 still happens and that's still obvious for above stated reasons.

10 keys is in the suggested range...the question is whether 9 keys is a regular price (and therefore has a right to be in range) or is a quicksale.

COULD be a quicksale price?

http://www.tf2outpost.com/trade/15861420 - Has sold (Check backpack)

http://www.tf2outpost.com/trade/15713074 - Has sold (Check backpack)

Yes 9 keys & others below 10 are yet to sell. 3 days on one of 9 keys has YET to sell.

Seems like an outlier to me though it's not selling fast. :/ I'm staying neutral on this because you have 4 solds at 10 keys, 2 fast solds as 9.5 keys but a contradicting 3 day unsold at 9 keys. :|

Hmm only 2 links at 9 keys but both still unsold and bumped today (so unsold for at least 10 hours, no quicksell price). Much competition at 10 keys but it seems that some of them really sell. Seems like a good range with the average price at 9.5 keys.