where does the high end come from?

Range doesn't seem to come from anywhere, you also said 3.5 was a 'quicksell' so I'm confused why it's in the range. Sorry, downvote.

From the looks of it all you paid him was 2 buds and 17 keys so unless you post a screenshot of the completed trade proving you gave an extra 10 keys, I can only assume you're lying and trying to manipulate the price.

http://www.tf2outpost.com/trade/15927914 The original owner sold it for a hat worth only around 2 buds. So yeah, you're lying about what you paid for it, you're ignoring that it originally sold for basically 2 buds, and you're basing the high end off your buyout. http://www.tf2outpost.com/trade/16285192

Please take a closer look at the site rules before making your next suggestion; http://backpack.tf/vote?showrules=1