makes no sense when theres a seller for 25 keys

This is a high outlier for sure, I sold this for 18 keys if I remember correctly

Why even range with a single sale? So much wrong with this suggestion there

Some things wrong here: can't have a range with 1 sale, use averages and add them up then round them.

Don't just use sellers as prices, we usually use sales to price items, so you would also need a sale for the pencil pusher and the headsplitter to proof their price.

With a seller at 25 keys, this sale does look a bit high, so this might need a bigger range, maybe try to find other sales.

The long version of how to do price suggestions is here: http://forums.backpack.tf/index.php?/topic/6033-guide-for-unusual-price-suggestions/